crates: vendor annotate-snippets crate

This merely adds the crate to our repository. Some cosmetic changes are made to make it work in our repo and follow our conventions, such as changing the name to `ruff_annotate_snippets`. We retain the original license information. We do drop some things, such as benchmarks, but keep tests and examples.
2025-08-04 02:39:12 +00:00 · 2024-12-20 12:55:16 -05:00 · 2024-12-20 12:55:16 -05:00 · 9c27c57b5b
commit 9c27c57b5b
parent 4f3209a3ec
58 changed files with 6171 additions and 8 deletions
--- a/crates/ruff_annotate_snippets/Cargo.toml
+++ b/crates/ruff_annotate_snippets/Cargo.toml
@ -0,0 +1,37 @@
+[package]
+name = "ruff_annotate_snippets"
+version = "0.1.0"
+publish = false
+authors = { workspace = true }
+edition = { workspace = true }
+rust-version = { workspace = true }
+homepage = { workspace = true }
+documentation = { workspace = true }
+repository = { workspace = true }
+license = "MIT OR Apache-2.0"
+
+[lib]
+
+[features]
+default = []
+testing-colors = []
+
+[dependencies]
+anstyle = { workspace = true }
+memchr = { workspace = true }
+unicode-width = { workspace = true }
+
+[dev-dependencies]
+ruff_annotate_snippets = { workspace = true, features = ["testing-colors"] }
+anstream = { workspace = true }
+serde = { workspace = true, features = ["derive"] }
+snapbox = { workspace = true, features = ["diff", "term-svg", "cmd", "examples"] }
+toml = { workspace = true }
+tryfn = { workspace = true }
+
+[[test]]
+name = "fixtures"
+harness = false
+
+[lints]
+workspace = true
--- a/crates/ruff_annotate_snippets/LICENSE-APACHE
+++ b/crates/ruff_annotate_snippets/LICENSE-APACHE
@ -0,0 +1,202 @@
+                                 Apache License
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+
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--- a/crates/ruff_annotate_snippets/LICENSE-MIT
+++ b/crates/ruff_annotate_snippets/LICENSE-MIT
@ -0,0 +1,19 @@
+Copyright (c) Individual contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
--- a/crates/ruff_annotate_snippets/README.md
+++ b/crates/ruff_annotate_snippets/README.md
@ -0,0 +1,15 @@
+This is a fork of the [`annotate-snippets` crate]. The principle motivation for
+this fork, at the time of writing, is [issue #167]. Specifically, we wanted to
+upgrade our version of `annotate-snippets`, but do so _without_ changing our
+diagnostic message format.
+
+This copy of `annotate-snippets` is basically identical to upstream, but with
+an extra `Level::None` variant that permits skipping over a new non-optional
+header emitted by `annotate-snippets`.
+
+More generally, it seems plausible that we may want to tweak other aspects of
+the output format in the future, so it might make sense to stick with our own
+copy so that we can be masters of our own destiny.
+
+[issue #167]: https://github.com/rust-lang/annotate-snippets-rs/issues/167
+[`annotate-snippets` crate]: https://github.com/rust-lang/annotate-snippets-rs
--- a/crates/ruff_annotate_snippets/examples/expected_type.rs
+++ b/crates/ruff_annotate_snippets/examples/expected_type.rs
@ -0,0 +1,23 @@
+use ruff_annotate_snippets::{Level, Renderer, Snippet};
+
+fn main() {
+    let source = r#"                annotations: vec![SourceAnnotation {
+                label: "expected struct `annotate_snippets::snippet::Slice`, found reference"
+                    ,
+                range: <22, 25>,"#;
+    let message = Level::Error.title("expected type, found `22`").snippet(
+        Snippet::source(source)
+            .line_start(26)
+            .origin("examples/footer.rs")
+            .fold(true)
+            .annotation(
+                Level::Error
+                    .span(193..195)
+                    .label("expected struct `annotate_snippets::snippet::Slice`, found reference"),
+            )
+            .annotation(Level::Info.span(34..50).label("while parsing this struct")),
+    );
+
+    let renderer = Renderer::styled();
+    anstream::println!("{}", renderer.render(message));
+}
--- a/crates/ruff_annotate_snippets/examples/expected_type.svg
+++ b/crates/ruff_annotate_snippets/examples/expected_type.svg
@ -0,0 +1,46 @@
+<svg width="860px" height="218px" xmlns="http://www.w3.org/2000/svg">
+  <style>
+    .fg { fill: #AAAAAA }
+    .bg { background: #000000 }
+    .fg-bright-blue { fill: #5555FF }
+    .fg-bright-red { fill: #FF5555 }
+    .container {
+      padding: 0 10px;
+      line-height: 18px;
+    }
+    .bold { font-weight: bold; }
+    tspan {
+      font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+      white-space: pre;
+      line-height: 18px;
+    }
+  </style>
+
+  <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
+
+  <text xml:space="preserve" class="container fg">
+    <tspan x="10px" y="28px"><tspan class="fg-bright-red bold">error</tspan><tspan>: </tspan><tspan class="bold">expected type, found `22`</tspan>
+</tspan>
+    <tspan x="10px" y="46px"><tspan>  </tspan><tspan class="fg-bright-blue bold">--&gt;</tspan><tspan> examples/footer.rs:29:25</tspan>
+</tspan>
+    <tspan x="10px" y="64px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="82px"><tspan class="fg-bright-blue bold">26 |</tspan><tspan>                 annotations: vec![SourceAnnotation {</tspan>
+</tspan>
+    <tspan x="10px" y="100px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>                                   </tspan><tspan class="fg-bright-blue bold">----------------</tspan><tspan> </tspan><tspan class="fg-bright-blue bold">info: while parsing this struct</tspan>
+</tspan>
+    <tspan x="10px" y="118px"><tspan class="fg-bright-blue bold">27 |</tspan><tspan>                 label: "expected struct `annotate_snippets::snippet::Slice`, found reference"</tspan>
+</tspan>
+    <tspan x="10px" y="136px"><tspan class="fg-bright-blue bold">28 |</tspan><tspan>                     ,</tspan>
+</tspan>
+    <tspan x="10px" y="154px"><tspan class="fg-bright-blue bold">29 |</tspan><tspan>                 range: &lt;22, 25&gt;,</tspan>
+</tspan>
+    <tspan x="10px" y="172px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>                         </tspan><tspan class="fg-bright-red bold">^^</tspan><tspan> </tspan><tspan class="fg-bright-red bold">expected struct `annotate_snippets::snippet::Slice`, found reference</tspan>
+</tspan>
+    <tspan x="10px" y="190px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="208px">
+</tspan>
+  </text>
+
+</svg>
--- a/crates/ruff_annotate_snippets/examples/footer.rs
+++ b/crates/ruff_annotate_snippets/examples/footer.rs
@ -0,0 +1,22 @@
+use ruff_annotate_snippets::{Level, Renderer, Snippet};
+
+fn main() {
+    let message =
+        Level::Error
+            .title("mismatched types")
+            .id("E0308")
+            .snippet(
+                Snippet::source("        slices: vec![\"A\",")
+                    .line_start(13)
+                    .origin("src/multislice.rs")
+                    .annotation(Level::Error.span(21..24).label(
+                        "expected struct `annotate_snippets::snippet::Slice`, found reference",
+                    )),
+            )
+            .footer(Level::Note.title(
+                "expected type: `snippet::Annotation`\n   found type: `__&__snippet::Annotation`",
+            ));
+
+    let renderer = Renderer::styled();
+    anstream::println!("{}", renderer.render(message));
+}
--- a/crates/ruff_annotate_snippets/examples/footer.svg
+++ b/crates/ruff_annotate_snippets/examples/footer.svg
@ -0,0 +1,43 @@
+<svg width="844px" height="182px" xmlns="http://www.w3.org/2000/svg">
+  <style>
+    .fg { fill: #AAAAAA }
+    .bg { background: #000000 }
+    .fg-bright-blue { fill: #5555FF }
+    .fg-bright-green { fill: #55FF55 }
+    .fg-bright-red { fill: #FF5555 }
+    .container {
+      padding: 0 10px;
+      line-height: 18px;
+    }
+    .bold { font-weight: bold; }
+    tspan {
+      font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+      white-space: pre;
+      line-height: 18px;
+    }
+  </style>
+
+  <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
+
+  <text xml:space="preserve" class="container fg">
+    <tspan x="10px" y="28px"><tspan class="fg-bright-red bold">error[E0308]</tspan><tspan>: </tspan><tspan class="bold">mismatched types</tspan>
+</tspan>
+    <tspan x="10px" y="46px"><tspan>  </tspan><tspan class="fg-bright-blue bold">--&gt;</tspan><tspan> src/multislice.rs:13:22</tspan>
+</tspan>
+    <tspan x="10px" y="64px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="82px"><tspan class="fg-bright-blue bold">13 |</tspan><tspan>         slices: vec!["A",</tspan>
+</tspan>
+    <tspan x="10px" y="100px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>                      </tspan><tspan class="fg-bright-red bold">^^^</tspan><tspan> </tspan><tspan class="fg-bright-red bold">expected struct `annotate_snippets::snippet::Slice`, found reference</tspan>
+</tspan>
+    <tspan x="10px" y="118px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="136px"><tspan>   </tspan><tspan class="fg-bright-blue bold">= </tspan><tspan class="fg-bright-green bold">note</tspan><tspan>: expected type: `snippet::Annotation`</tspan>
+</tspan>
+    <tspan x="10px" y="154px"><tspan>              found type: `__&amp;__snippet::Annotation`</tspan>
+</tspan>
+    <tspan x="10px" y="172px">
+</tspan>
+  </text>
+
+</svg>
--- a/crates/ruff_annotate_snippets/examples/format.rs
+++ b/crates/ruff_annotate_snippets/examples/format.rs
@ -0,0 +1,44 @@
+use ruff_annotate_snippets::{Level, Renderer, Snippet};
+
+fn main() {
+    let source = r#") -> Option<String> {
+    for ann in annotations {
+        match (ann.range.0, ann.range.1) {
+            (None, None) => continue,
+            (Some(start), Some(end)) if start > end_index => continue,
+            (Some(start), Some(end)) if start >= start_index => {
+                let label = if let Some(ref label) = ann.label {
+                    format!(" {}", label)
+                } else {
+                    String::from("")
+                };
+
+                return Some(format!(
+                    "{}{}{}",
+                    " ".repeat(start - start_index),
+                    "^".repeat(end - start),
+                    label
+                ));
+            }
+            _ => continue,
+        }
+    }"#;
+    let message = Level::Error.title("mismatched types").id("E0308").snippet(
+        Snippet::source(source)
+            .line_start(51)
+            .origin("src/format.rs")
+            .annotation(
+                Level::Warning
+                    .span(5..19)
+                    .label("expected `Option<String>` because of return type"),
+            )
+            .annotation(
+                Level::Error
+                    .span(26..724)
+                    .label("expected enum `std::option::Option`"),
+            ),
+    );
+
+    let renderer = Renderer::styled();
+    anstream::println!("{}", renderer.render(message));
+}
--- a/crates/ruff_annotate_snippets/examples/format.svg
+++ b/crates/ruff_annotate_snippets/examples/format.svg
@ -0,0 +1,83 @@
+<svg width="740px" height="542px" xmlns="http://www.w3.org/2000/svg">
+  <style>
+    .fg { fill: #AAAAAA }
+    .bg { background: #000000 }
+    .fg-bright-blue { fill: #5555FF }
+    .fg-bright-red { fill: #FF5555 }
+    .fg-yellow { fill: #AA5500 }
+    .container {
+      padding: 0 10px;
+      line-height: 18px;
+    }
+    .bold { font-weight: bold; }
+    tspan {
+      font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+      white-space: pre;
+      line-height: 18px;
+    }
+  </style>
+
+  <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
+
+  <text xml:space="preserve" class="container fg">
+    <tspan x="10px" y="28px"><tspan class="fg-bright-red bold">error[E0308]</tspan><tspan>: </tspan><tspan class="bold">mismatched types</tspan>
+</tspan>
+    <tspan x="10px" y="46px"><tspan>  </tspan><tspan class="fg-bright-blue bold">--&gt;</tspan><tspan> src/format.rs:51:6</tspan>
+</tspan>
+    <tspan x="10px" y="64px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="82px"><tspan class="fg-bright-blue bold">51 |</tspan><tspan>   ) -&gt; Option&lt;String&gt; {</tspan>
+</tspan>
+    <tspan x="10px" y="100px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>        </tspan><tspan class="fg-yellow bold">--------------</tspan><tspan> </tspan><tspan class="fg-yellow bold">expected `Option&lt;String&gt;` because of return type</tspan>
+</tspan>
+    <tspan x="10px" y="118px"><tspan class="fg-bright-blue bold">52 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">/</tspan><tspan>     for ann in annotations {</tspan>
+</tspan>
+    <tspan x="10px" y="136px"><tspan class="fg-bright-blue bold">53 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>         match (ann.range.0, ann.range.1) {</tspan>
+</tspan>
+    <tspan x="10px" y="154px"><tspan class="fg-bright-blue bold">54 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>             (None, None) =&gt; continue,</tspan>
+</tspan>
+    <tspan x="10px" y="172px"><tspan class="fg-bright-blue bold">55 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>             (Some(start), Some(end)) if start &gt; end_index =&gt; continue,</tspan>
+</tspan>
+    <tspan x="10px" y="190px"><tspan class="fg-bright-blue bold">56 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>             (Some(start), Some(end)) if start &gt;= start_index =&gt; {</tspan>
+</tspan>
+    <tspan x="10px" y="208px"><tspan class="fg-bright-blue bold">57 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>                 let label = if let Some(ref label) = ann.label {</tspan>
+</tspan>
+    <tspan x="10px" y="226px"><tspan class="fg-bright-blue bold">58 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>                     format!(" {}", label)</tspan>
+</tspan>
+    <tspan x="10px" y="244px"><tspan class="fg-bright-blue bold">59 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>                 } else {</tspan>
+</tspan>
+    <tspan x="10px" y="262px"><tspan class="fg-bright-blue bold">60 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>                     String::from("")</tspan>
+</tspan>
+    <tspan x="10px" y="280px"><tspan class="fg-bright-blue bold">61 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>                 };</tspan>
+</tspan>
+    <tspan x="10px" y="298px"><tspan class="fg-bright-blue bold">62 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="316px"><tspan class="fg-bright-blue bold">63 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>                 return Some(format!(</tspan>
+</tspan>
+    <tspan x="10px" y="334px"><tspan class="fg-bright-blue bold">64 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>                     "{}{}{}",</tspan>
+</tspan>
+    <tspan x="10px" y="352px"><tspan class="fg-bright-blue bold">65 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>                     " ".repeat(start - start_index),</tspan>
+</tspan>
+    <tspan x="10px" y="370px"><tspan class="fg-bright-blue bold">66 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>                     "^".repeat(end - start),</tspan>
+</tspan>
+    <tspan x="10px" y="388px"><tspan class="fg-bright-blue bold">67 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>                     label</tspan>
+</tspan>
+    <tspan x="10px" y="406px"><tspan class="fg-bright-blue bold">68 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>                 ));</tspan>
+</tspan>
+    <tspan x="10px" y="424px"><tspan class="fg-bright-blue bold">69 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>             }</tspan>
+</tspan>
+    <tspan x="10px" y="442px"><tspan class="fg-bright-blue bold">70 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>             _ =&gt; continue,</tspan>
+</tspan>
+    <tspan x="10px" y="460px"><tspan class="fg-bright-blue bold">71 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>         }</tspan>
+</tspan>
+    <tspan x="10px" y="478px"><tspan class="fg-bright-blue bold">72 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>     }</tspan>
+</tspan>
+    <tspan x="10px" y="496px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|____^</tspan><tspan> </tspan><tspan class="fg-bright-red bold">expected enum `std::option::Option`</tspan>
+</tspan>
+    <tspan x="10px" y="514px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="532px">
+</tspan>
+  </text>
+
+</svg>
--- a/crates/ruff_annotate_snippets/examples/multislice.rs
+++ b/crates/ruff_annotate_snippets/examples/multislice.rs
@ -0,0 +1,19 @@
+use ruff_annotate_snippets::{Level, Renderer, Snippet};
+
+fn main() {
+    let message = Level::Error
+        .title("mismatched types")
+        .snippet(
+            Snippet::source("Foo")
+                .line_start(51)
+                .origin("src/format.rs"),
+        )
+        .snippet(
+            Snippet::source("Faa")
+                .line_start(129)
+                .origin("src/display.rs"),
+        );
+
+    let renderer = Renderer::styled();
+    anstream::println!("{}", renderer.render(message));
+}
--- a/crates/ruff_annotate_snippets/examples/multislice.svg
+++ b/crates/ruff_annotate_snippets/examples/multislice.svg
@ -0,0 +1,44 @@
+<svg width="740px" height="200px" xmlns="http://www.w3.org/2000/svg">
+  <style>
+    .fg { fill: #AAAAAA }
+    .bg { background: #000000 }
+    .fg-bright-blue { fill: #5555FF }
+    .fg-bright-red { fill: #FF5555 }
+    .container {
+      padding: 0 10px;
+      line-height: 18px;
+    }
+    .bold { font-weight: bold; }
+    tspan {
+      font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+      white-space: pre;
+      line-height: 18px;
+    }
+  </style>
+
+  <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
+
+  <text xml:space="preserve" class="container fg">
+    <tspan x="10px" y="28px"><tspan class="fg-bright-red bold">error</tspan><tspan>: </tspan><tspan class="bold">mismatched types</tspan>
+</tspan>
+    <tspan x="10px" y="46px"><tspan>   </tspan><tspan class="fg-bright-blue bold">--&gt;</tspan><tspan> src/format.rs</tspan>
+</tspan>
+    <tspan x="10px" y="64px"><tspan>    </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="82px"><tspan class="fg-bright-blue bold"> 51 |</tspan><tspan> Foo</tspan>
+</tspan>
+    <tspan x="10px" y="100px"><tspan>    </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="118px"><tspan>   </tspan><tspan class="fg-bright-blue bold">:::</tspan><tspan> src/display.rs</tspan>
+</tspan>
+    <tspan x="10px" y="136px"><tspan>    </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="154px"><tspan class="fg-bright-blue bold">129 |</tspan><tspan> Faa</tspan>
+</tspan>
+    <tspan x="10px" y="172px"><tspan>    </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="190px">
+</tspan>
+  </text>
+
+</svg>
--- a/crates/ruff_annotate_snippets/src/lib.rs
+++ b/crates/ruff_annotate_snippets/src/lib.rs
@ -0,0 +1,69 @@
+//! A library for formatting of text or programming code snippets.
+//!
+//! It's primary purpose is to build an ASCII-graphical representation of the snippet
+//! with annotations.
+//!
+//! # Example
+//!
+//! ```rust
+#![doc = include_str!("../examples/expected_type.rs")]
+//! ```
+//!
+#![doc = include_str!("../examples/expected_type.svg")]
+//!
+//! The crate uses a three stage process with two conversions between states:
+//!
+//! ```text
+//! Message --> Renderer --> impl Display
+//! ```
+//!
+//! The input type - [Message] is a structure designed
+//! to align with likely output from any parser whose code snippet is to be
+//! annotated.
+//!
+//! The middle structure - [Renderer] is a structure designed
+//! to convert a snippet into an internal structure that is designed to store
+//! the snippet data in a way that is easy to format.
+//! [Renderer] also handles the user-configurable formatting
+//! options, such as color, or margins.
+//!
+//! Finally, `impl Display` into a final `String` output.
+//!
+//! # features
+//! - `testing-colors` - Makes [Renderer::styled] colors OS independent, which
+//! allows for easier testing when testing colored output. It should be added as
+//! a feature in `[dev-dependencies]`, which can be done with the following command:
+//! ```text
+//! cargo add annotate-snippets --dev --feature testing-colors
+//! ```
+
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+#![warn(clippy::print_stderr)]
+#![warn(clippy::print_stdout)]
+#![warn(missing_debug_implementations)]
+// Since this is a vendored copy of `annotate-snippets`, we squash Clippy
+// warnings from upstream in order to the reduce the diff. If our copy drifts
+// far from upstream such that patches become impractical to apply in both
+// places, then we can get rid of these suppressions and fix the lints.
+#![allow(
+    clippy::return_self_not_must_use,
+    clippy::cast_possible_truncation,
+    clippy::cast_precision_loss,
+    clippy::explicit_iter_loop,
+    clippy::unused_self,
+    clippy::unnecessary_wraps,
+    clippy::range_plus_one,
+    clippy::redundant_closure_for_method_calls,
+    clippy::struct_field_names,
+    clippy::cloned_instead_of_copied,
+    clippy::cast_sign_loss,
+    clippy::needless_as_bytes,
+    clippy::unnecessary_map_or
+)]
+
+pub mod renderer;
+mod snippet;
+
+#[doc(inline)]
+pub use renderer::Renderer;
+pub use snippet::*;
--- a/crates/ruff_annotate_snippets/src/renderer/display_list.rs
+++ b/crates/ruff_annotate_snippets/src/renderer/display_list.rs
--- a/crates/ruff_annotate_snippets/src/renderer/margin.rs
+++ b/crates/ruff_annotate_snippets/src/renderer/margin.rs
@ -0,0 +1,119 @@
+use std::cmp::{max, min};
+
+const ELLIPSIS_PASSING: usize = 6;
+const LONG_WHITESPACE: usize = 20;
+const LONG_WHITESPACE_PADDING: usize = 4;
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub(crate) struct Margin {
+    /// The available whitespace in the left that can be consumed when centering.
+    whitespace_left: usize,
+    /// The column of the beginning of left-most span.
+    span_left: usize,
+    /// The column of the end of right-most span.
+    span_right: usize,
+    /// The beginning of the line to be displayed.
+    computed_left: usize,
+    /// The end of the line to be displayed.
+    computed_right: usize,
+    /// The current width of the terminal. 140 by default and in tests.
+    term_width: usize,
+    /// The end column of a span label, including the span. Doesn't account for labels not in the
+    /// same line as the span.
+    label_right: usize,
+}
+
+impl Margin {
+    pub(crate) fn new(
+        whitespace_left: usize,
+        span_left: usize,
+        span_right: usize,
+        label_right: usize,
+        term_width: usize,
+        max_line_len: usize,
+    ) -> Self {
+        // The 6 is padding to give a bit of room for `...` when displaying:
+        // ```
+        // error: message
+        //   --> file.rs:16:58
+        //    |
+        // 16 | ... fn foo(self) -> Self::Bar {
+        //    |                     ^^^^^^^^^
+        // ```
+
+        let mut m = Margin {
+            whitespace_left: whitespace_left.saturating_sub(ELLIPSIS_PASSING),
+            span_left: span_left.saturating_sub(ELLIPSIS_PASSING),
+            span_right: span_right + ELLIPSIS_PASSING,
+            computed_left: 0,
+            computed_right: 0,
+            term_width,
+            label_right: label_right + ELLIPSIS_PASSING,
+        };
+        m.compute(max_line_len);
+        m
+    }
+
+    pub(crate) fn was_cut_left(&self) -> bool {
+        self.computed_left > 0
+    }
+
+    pub(crate) fn was_cut_right(&self, line_len: usize) -> bool {
+        let right =
+            if self.computed_right == self.span_right || self.computed_right == self.label_right {
+                // Account for the "..." padding given above. Otherwise we end up with code lines that
+                // do fit but end in "..." as if they were trimmed.
+                self.computed_right - ELLIPSIS_PASSING
+            } else {
+                self.computed_right
+            };
+        right < line_len && self.computed_left + self.term_width < line_len
+    }
+
+    fn compute(&mut self, max_line_len: usize) {
+        // When there's a lot of whitespace (>20), we want to trim it as it is useless.
+        self.computed_left = if self.whitespace_left > LONG_WHITESPACE {
+            self.whitespace_left - (LONG_WHITESPACE - LONG_WHITESPACE_PADDING) // We want some padding.
+        } else {
+            0
+        };
+        // We want to show as much as possible, max_line_len is the right-most boundary for the
+        // relevant code.
+        self.computed_right = max(max_line_len, self.computed_left);
+
+        if self.computed_right - self.computed_left > self.term_width {
+            // Trimming only whitespace isn't enough, let's get craftier.
+            if self.label_right - self.whitespace_left <= self.term_width {
+                // Attempt to fit the code window only trimming whitespace.
+                self.computed_left = self.whitespace_left;
+                self.computed_right = self.computed_left + self.term_width;
+            } else if self.label_right - self.span_left <= self.term_width {
+                // Attempt to fit the code window considering only the spans and labels.
+                let padding_left = (self.term_width - (self.label_right - self.span_left)) / 2;
+                self.computed_left = self.span_left.saturating_sub(padding_left);
+                self.computed_right = self.computed_left + self.term_width;
+            } else if self.span_right - self.span_left <= self.term_width {
+                // Attempt to fit the code window considering the spans and labels plus padding.
+                let padding_left = (self.term_width - (self.span_right - self.span_left)) / 5 * 2;
+                self.computed_left = self.span_left.saturating_sub(padding_left);
+                self.computed_right = self.computed_left + self.term_width;
+            } else {
+                // Mostly give up but still don't show the full line.
+                self.computed_left = self.span_left;
+                self.computed_right = self.span_right;
+            }
+        }
+    }
+
+    pub(crate) fn left(&self, line_len: usize) -> usize {
+        min(self.computed_left, line_len)
+    }
+
+    pub(crate) fn right(&self, line_len: usize) -> usize {
+        if line_len.saturating_sub(self.computed_left) <= self.term_width {
+            line_len
+        } else {
+            min(line_len, self.computed_right)
+        }
+    }
+}
--- a/crates/ruff_annotate_snippets/src/renderer/mod.rs
+++ b/crates/ruff_annotate_snippets/src/renderer/mod.rs
@ -0,0 +1,163 @@
+//! The renderer for [`Message`]s
+//!
+//! # Example
+//! ```
+//! use ruff_annotate_snippets::{Renderer, Snippet, Level};
+//! let snippet = Level::Error.title("mismatched types")
+//!     .snippet(Snippet::source("Foo").line_start(51).origin("src/format.rs"))
+//!     .snippet(Snippet::source("Faa").line_start(129).origin("src/display.rs"));
+//!
+//!  let renderer = Renderer::styled();
+//!  println!("{}", renderer.render(snippet));
+
+mod display_list;
+mod margin;
+mod styled_buffer;
+pub(crate) mod stylesheet;
+
+use crate::snippet::Message;
+pub use anstyle::*;
+use display_list::DisplayList;
+use margin::Margin;
+use std::fmt::Display;
+use stylesheet::Stylesheet;
+
+pub const DEFAULT_TERM_WIDTH: usize = 140;
+
+/// A renderer for [`Message`]s
+#[derive(Clone, Debug)]
+pub struct Renderer {
+    anonymized_line_numbers: bool,
+    term_width: usize,
+    stylesheet: Stylesheet,
+}
+
+impl Renderer {
+    /// No terminal styling
+    pub const fn plain() -> Self {
+        Self {
+            anonymized_line_numbers: false,
+            term_width: DEFAULT_TERM_WIDTH,
+            stylesheet: Stylesheet::plain(),
+        }
+    }
+
+    /// Default terminal styling
+    ///
+    /// # Note
+    /// When testing styled terminal output, see the [`testing-colors` feature](crate#features)
+    pub const fn styled() -> Self {
+        const USE_WINDOWS_COLORS: bool = cfg!(windows) && !cfg!(feature = "testing-colors");
+        const BRIGHT_BLUE: Style = if USE_WINDOWS_COLORS {
+            AnsiColor::BrightCyan.on_default()
+        } else {
+            AnsiColor::BrightBlue.on_default()
+        };
+        Self {
+            stylesheet: Stylesheet {
+                error: AnsiColor::BrightRed.on_default().effects(Effects::BOLD),
+                warning: if USE_WINDOWS_COLORS {
+                    AnsiColor::BrightYellow.on_default()
+                } else {
+                    AnsiColor::Yellow.on_default()
+                }
+                .effects(Effects::BOLD),
+                info: BRIGHT_BLUE.effects(Effects::BOLD),
+                note: AnsiColor::BrightGreen.on_default().effects(Effects::BOLD),
+                help: AnsiColor::BrightCyan.on_default().effects(Effects::BOLD),
+                line_no: BRIGHT_BLUE.effects(Effects::BOLD),
+                emphasis: if USE_WINDOWS_COLORS {
+                    AnsiColor::BrightWhite.on_default()
+                } else {
+                    Style::new()
+                }
+                .effects(Effects::BOLD),
+                none: Style::new(),
+            },
+            ..Self::plain()
+        }
+    }
+
+    /// Anonymize line numbers
+    ///
+    /// This enables (or disables) line number anonymization. When enabled, line numbers are replaced
+    /// with `LL`.
+    ///
+    /// # Example
+    ///
+    /// ```text
+    ///   --> $DIR/whitespace-trimming.rs:4:193
+    ///    |
+    /// LL | ...                   let _: () = 42;
+    ///    |                                   ^^ expected (), found integer
+    ///    |
+    /// ```
+    pub const fn anonymized_line_numbers(mut self, anonymized_line_numbers: bool) -> Self {
+        self.anonymized_line_numbers = anonymized_line_numbers;
+        self
+    }
+
+    // Set the terminal width
+    pub const fn term_width(mut self, term_width: usize) -> Self {
+        self.term_width = term_width;
+        self
+    }
+
+    /// Set the output style for `error`
+    pub const fn error(mut self, style: Style) -> Self {
+        self.stylesheet.error = style;
+        self
+    }
+
+    /// Set the output style for `warning`
+    pub const fn warning(mut self, style: Style) -> Self {
+        self.stylesheet.warning = style;
+        self
+    }
+
+    /// Set the output style for `info`
+    pub const fn info(mut self, style: Style) -> Self {
+        self.stylesheet.info = style;
+        self
+    }
+
+    /// Set the output style for `note`
+    pub const fn note(mut self, style: Style) -> Self {
+        self.stylesheet.note = style;
+        self
+    }
+
+    /// Set the output style for `help`
+    pub const fn help(mut self, style: Style) -> Self {
+        self.stylesheet.help = style;
+        self
+    }
+
+    /// Set the output style for line numbers
+    pub const fn line_no(mut self, style: Style) -> Self {
+        self.stylesheet.line_no = style;
+        self
+    }
+
+    /// Set the output style for emphasis
+    pub const fn emphasis(mut self, style: Style) -> Self {
+        self.stylesheet.emphasis = style;
+        self
+    }
+
+    /// Set the output style for none
+    pub const fn none(mut self, style: Style) -> Self {
+        self.stylesheet.none = style;
+        self
+    }
+
+    /// Render a snippet into a `Display`able object
+    pub fn render<'a>(&'a self, msg: Message<'a>) -> impl Display + 'a {
+        DisplayList::new(
+            msg,
+            &self.stylesheet,
+            self.anonymized_line_numbers,
+            self.term_width,
+        )
+    }
+}
--- a/crates/ruff_annotate_snippets/src/renderer/styled_buffer.rs
+++ b/crates/ruff_annotate_snippets/src/renderer/styled_buffer.rs
@ -0,0 +1,97 @@
+//! Adapted from [styled_buffer]
+//!
+//! [styled_buffer]: https://github.com/rust-lang/rust/blob/894f7a4ba6554d3797404bbf550d9919df060b97/compiler/rustc_errors/src/styled_buffer.rs
+
+use crate::renderer::stylesheet::Stylesheet;
+use anstyle::Style;
+use std::fmt;
+use std::fmt::Write;
+
+#[derive(Debug)]
+pub(crate) struct StyledBuffer {
+    lines: Vec<Vec<StyledChar>>,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub(crate) struct StyledChar {
+    ch: char,
+    style: Style,
+}
+
+impl StyledChar {
+    pub(crate) const SPACE: Self = StyledChar::new(' ', Style::new());
+
+    pub(crate) const fn new(ch: char, style: Style) -> StyledChar {
+        StyledChar { ch, style }
+    }
+}
+
+impl StyledBuffer {
+    pub(crate) fn new() -> StyledBuffer {
+        StyledBuffer { lines: vec![] }
+    }
+
+    fn ensure_lines(&mut self, line: usize) {
+        if line >= self.lines.len() {
+            self.lines.resize(line + 1, Vec::new());
+        }
+    }
+
+    pub(crate) fn render(&self, stylesheet: &Stylesheet) -> Result<String, fmt::Error> {
+        let mut str = String::new();
+        for (i, line) in self.lines.iter().enumerate() {
+            let mut current_style = stylesheet.none;
+            for ch in line {
+                if ch.style != current_style {
+                    if !line.is_empty() {
+                        write!(str, "{}", current_style.render_reset())?;
+                    }
+                    current_style = ch.style;
+                    write!(str, "{}", current_style.render())?;
+                }
+                write!(str, "{}", ch.ch)?;
+            }
+            write!(str, "{}", current_style.render_reset())?;
+            if i != self.lines.len() - 1 {
+                writeln!(str)?;
+            }
+        }
+        Ok(str)
+    }
+
+    /// Sets `chr` with `style` for given `line`, `col`.
+    /// If `line` does not exist in our buffer, adds empty lines up to the given
+    /// and fills the last line with unstyled whitespace.
+    pub(crate) fn putc(&mut self, line: usize, col: usize, chr: char, style: Style) {
+        self.ensure_lines(line);
+        if col >= self.lines[line].len() {
+            self.lines[line].resize(col + 1, StyledChar::SPACE);
+        }
+        self.lines[line][col] = StyledChar::new(chr, style);
+    }
+
+    /// Sets `string` with `style` for given `line`, starting from `col`.
+    /// If `line` does not exist in our buffer, adds empty lines up to the given
+    /// and fills the last line with unstyled whitespace.
+    pub(crate) fn puts(&mut self, line: usize, col: usize, string: &str, style: Style) {
+        let mut n = col;
+        for c in string.chars() {
+            self.putc(line, n, c, style);
+            n += 1;
+        }
+    }
+    /// For given `line` inserts `string` with `style` after old content of that line,
+    /// adding lines if needed
+    pub(crate) fn append(&mut self, line: usize, string: &str, style: Style) {
+        if line >= self.lines.len() {
+            self.puts(line, 0, string, style);
+        } else {
+            let col = self.lines[line].len();
+            self.puts(line, col, string, style);
+        }
+    }
+
+    pub(crate) fn num_lines(&self) -> usize {
+        self.lines.len()
+    }
+}
--- a/crates/ruff_annotate_snippets/src/renderer/stylesheet.rs
+++ b/crates/ruff_annotate_snippets/src/renderer/stylesheet.rs
@ -0,0 +1,68 @@
+use anstyle::Style;
+
+#[derive(Clone, Copy, Debug)]
+pub(crate) struct Stylesheet {
+    pub(crate) error: Style,
+    pub(crate) warning: Style,
+    pub(crate) info: Style,
+    pub(crate) note: Style,
+    pub(crate) help: Style,
+    pub(crate) line_no: Style,
+    pub(crate) emphasis: Style,
+    pub(crate) none: Style,
+}
+
+impl Default for Stylesheet {
+    fn default() -> Self {
+        Self::plain()
+    }
+}
+
+impl Stylesheet {
+    pub(crate) const fn plain() -> Self {
+        Self {
+            error: Style::new(),
+            warning: Style::new(),
+            info: Style::new(),
+            note: Style::new(),
+            help: Style::new(),
+            line_no: Style::new(),
+            emphasis: Style::new(),
+            none: Style::new(),
+        }
+    }
+}
+
+impl Stylesheet {
+    pub(crate) fn error(&self) -> &Style {
+        &self.error
+    }
+
+    pub(crate) fn warning(&self) -> &Style {
+        &self.warning
+    }
+
+    pub(crate) fn info(&self) -> &Style {
+        &self.info
+    }
+
+    pub(crate) fn note(&self) -> &Style {
+        &self.note
+    }
+
+    pub(crate) fn help(&self) -> &Style {
+        &self.help
+    }
+
+    pub(crate) fn line_no(&self) -> &Style {
+        &self.line_no
+    }
+
+    pub(crate) fn emphasis(&self) -> &Style {
+        &self.emphasis
+    }
+
+    pub(crate) fn none(&self) -> &Style {
+        &self.none
+    }
+}
--- a/crates/ruff_annotate_snippets/src/snippet.rs
+++ b/crates/ruff_annotate_snippets/src/snippet.rs
@ -0,0 +1,157 @@
+//! Structures used as an input for the library.
+//!
+//! Example:
+//!
+//! ```
+//! use ruff_annotate_snippets::*;
+//!
+//! Level::Error.title("mismatched types")
+//!     .snippet(Snippet::source("Foo").line_start(51).origin("src/format.rs"))
+//!     .snippet(Snippet::source("Faa").line_start(129).origin("src/display.rs"));
+//! ```
+
+use std::ops::Range;
+
+/// Primary structure provided for formatting
+///
+/// See [`Level::title`] to create a [`Message`]
+#[derive(Debug)]
+pub struct Message<'a> {
+    pub(crate) level: Level,
+    pub(crate) id: Option<&'a str>,
+    pub(crate) title: &'a str,
+    pub(crate) snippets: Vec<Snippet<'a>>,
+    pub(crate) footer: Vec<Message<'a>>,
+}
+
+impl<'a> Message<'a> {
+    pub fn id(mut self, id: &'a str) -> Self {
+        self.id = Some(id);
+        self
+    }
+
+    pub fn snippet(mut self, slice: Snippet<'a>) -> Self {
+        self.snippets.push(slice);
+        self
+    }
+
+    pub fn snippets(mut self, slice: impl IntoIterator<Item = Snippet<'a>>) -> Self {
+        self.snippets.extend(slice);
+        self
+    }
+
+    pub fn footer(mut self, footer: Message<'a>) -> Self {
+        self.footer.push(footer);
+        self
+    }
+
+    pub fn footers(mut self, footer: impl IntoIterator<Item = Message<'a>>) -> Self {
+        self.footer.extend(footer);
+        self
+    }
+}
+
+/// Structure containing the slice of text to be annotated and
+/// basic information about the location of the slice.
+///
+/// One `Snippet` is meant to represent a single, continuous,
+/// slice of source code that you want to annotate.
+#[derive(Debug)]
+pub struct Snippet<'a> {
+    pub(crate) origin: Option<&'a str>,
+    pub(crate) line_start: usize,
+
+    pub(crate) source: &'a str,
+    pub(crate) annotations: Vec<Annotation<'a>>,
+
+    pub(crate) fold: bool,
+}
+
+impl<'a> Snippet<'a> {
+    pub fn source(source: &'a str) -> Self {
+        Self {
+            origin: None,
+            line_start: 1,
+            source,
+            annotations: vec![],
+            fold: false,
+        }
+    }
+
+    pub fn line_start(mut self, line_start: usize) -> Self {
+        self.line_start = line_start;
+        self
+    }
+
+    pub fn origin(mut self, origin: &'a str) -> Self {
+        self.origin = Some(origin);
+        self
+    }
+
+    pub fn annotation(mut self, annotation: Annotation<'a>) -> Self {
+        self.annotations.push(annotation);
+        self
+    }
+
+    pub fn annotations(mut self, annotation: impl IntoIterator<Item = Annotation<'a>>) -> Self {
+        self.annotations.extend(annotation);
+        self
+    }
+
+    /// Hide lines without [`Annotation`]s
+    pub fn fold(mut self, fold: bool) -> Self {
+        self.fold = fold;
+        self
+    }
+}
+
+/// An annotation for a [`Snippet`].
+///
+/// See [`Level::span`] to create a [`Annotation`]
+#[derive(Debug)]
+pub struct Annotation<'a> {
+    /// The byte range of the annotation in the `source` string
+    pub(crate) range: Range<usize>,
+    pub(crate) label: Option<&'a str>,
+    pub(crate) level: Level,
+}
+
+impl<'a> Annotation<'a> {
+    pub fn label(mut self, label: &'a str) -> Self {
+        self.label = Some(label);
+        self
+    }
+}
+
+/// Types of annotations.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub enum Level {
+    /// Error annotations are displayed using red color and "^" character.
+    Error,
+    /// Warning annotations are displayed using blue color and "-" character.
+    Warning,
+    Info,
+    Note,
+    Help,
+}
+
+impl Level {
+    pub fn title(self, title: &str) -> Message<'_> {
+        Message {
+            level: self,
+            id: None,
+            title,
+            snippets: vec![],
+            footer: vec![],
+        }
+    }
+
+    /// Create a [`Annotation`] with the given span for a [`Snippet`]
+    pub fn span<'a>(self, span: Range<usize>) -> Annotation<'a> {
+        Annotation {
+            range: span,
+            label: None,
+            level: self,
+        }
+    }
+}
--- a/crates/ruff_annotate_snippets/tests/examples.rs
+++ b/crates/ruff_annotate_snippets/tests/examples.rs
@ -0,0 +1,37 @@
+#[test]
+fn expected_type() {
+    let target = "expected_type";
+    let expected = snapbox::file!["../examples/expected_type.svg": TermSvg];
+    assert_example(target, expected);
+}
+
+#[test]
+fn footer() {
+    let target = "footer";
+    let expected = snapbox::file!["../examples/footer.svg": TermSvg];
+    assert_example(target, expected);
+}
+
+#[test]
+fn format() {
+    let target = "format";
+    let expected = snapbox::file!["../examples/format.svg": TermSvg];
+    assert_example(target, expected);
+}
+
+#[test]
+fn multislice() {
+    let target = "multislice";
+    let expected = snapbox::file!["../examples/multislice.svg": TermSvg];
+    assert_example(target, expected);
+}
+
+#[track_caller]
+fn assert_example(target: &str, expected: snapbox::Data) {
+    let bin_path = snapbox::cmd::compile_example(target, ["--features=testing-colors"]).unwrap();
+    snapbox::cmd::Command::new(bin_path)
+        .env("CLICOLOR_FORCE", "1")
+        .assert()
+        .success()
+        .stdout_eq(expected.raw());
+}
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/ann_eof.svg
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/ann_eof.svg
@ -0,0 +1,36 @@
+<svg width="740px" height="128px" xmlns="http://www.w3.org/2000/svg">
+  <style>
+    .fg { fill: #AAAAAA }
+    .bg { background: #000000 }
+    .fg-bright-blue { fill: #5555FF }
+    .fg-bright-red { fill: #FF5555 }
+    .container {
+      padding: 0 10px;
+      line-height: 18px;
+    }
+    .bold { font-weight: bold; }
+    tspan {
+      font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+      white-space: pre;
+      line-height: 18px;
+    }
+  </style>
+
+  <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
+
+  <text xml:space="preserve" class="container fg">
+    <tspan x="10px" y="28px"><tspan class="fg-bright-red bold">error</tspan><tspan>: </tspan><tspan class="bold">expected `.`, `=`</tspan>
+</tspan>
+    <tspan x="10px" y="46px"><tspan> </tspan><tspan class="fg-bright-blue bold">--&gt;</tspan><tspan> Cargo.toml:1:5</tspan>
+</tspan>
+    <tspan x="10px" y="64px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="82px"><tspan class="fg-bright-blue bold">1 |</tspan><tspan> asdf</tspan>
+</tspan>
+    <tspan x="10px" y="100px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>     </tspan><tspan class="fg-bright-red bold">^</tspan>
+</tspan>
+    <tspan x="10px" y="118px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+  </text>
+
+</svg>
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/ann_eof.toml
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/ann_eof.toml
@ -0,0 +1,15 @@
+[message]
+level = "Error"
+title = "expected `.`, `=`"
+
+[[message.snippets]]
+source = "asdf"
+line_start = 1
+origin = "Cargo.toml"
+[[message.snippets.annotations]]
+label = ""
+level = "Error"
+range = [4, 4]
+
+[renderer]
+color = true
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/ann_insertion.svg
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/ann_insertion.svg
@ -0,0 +1,36 @@
+<svg width="740px" height="128px" xmlns="http://www.w3.org/2000/svg">
+  <style>
+    .fg { fill: #AAAAAA }
+    .bg { background: #000000 }
+    .fg-bright-blue { fill: #5555FF }
+    .fg-bright-red { fill: #FF5555 }
+    .container {
+      padding: 0 10px;
+      line-height: 18px;
+    }
+    .bold { font-weight: bold; }
+    tspan {
+      font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+      white-space: pre;
+      line-height: 18px;
+    }
+  </style>
+
+  <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
+
+  <text xml:space="preserve" class="container fg">
+    <tspan x="10px" y="28px"><tspan class="fg-bright-red bold">error</tspan><tspan>: </tspan><tspan class="bold">expected `.`, `=`</tspan>
+</tspan>
+    <tspan x="10px" y="46px"><tspan> </tspan><tspan class="fg-bright-blue bold">--&gt;</tspan><tspan> Cargo.toml:1:3</tspan>
+</tspan>
+    <tspan x="10px" y="64px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="82px"><tspan class="fg-bright-blue bold">1 |</tspan><tspan> asf</tspan>
+</tspan>
+    <tspan x="10px" y="100px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>   </tspan><tspan class="fg-bright-red bold">^</tspan><tspan> </tspan><tspan class="fg-bright-red bold">'d' belongs here</tspan>
+</tspan>
+    <tspan x="10px" y="118px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+  </text>
+
+</svg>
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/ann_insertion.toml
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/ann_insertion.toml
@ -0,0 +1,15 @@
+[message]
+level = "Error"
+title = "expected `.`, `=`"
+
+[[message.snippets]]
+source = "asf"
+line_start = 1
+origin = "Cargo.toml"
+[[message.snippets.annotations]]
+label = "'d' belongs here"
+level = "Error"
+range = [2, 2]
+
+[renderer]
+color = true
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/ann_multiline.svg
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/ann_multiline.svg
@ -0,0 +1,42 @@
+<svg width="740px" height="182px" xmlns="http://www.w3.org/2000/svg">
+  <style>
+    .fg { fill: #AAAAAA }
+    .bg { background: #000000 }
+    .fg-bright-blue { fill: #5555FF }
+    .fg-bright-red { fill: #FF5555 }
+    .container {
+      padding: 0 10px;
+      line-height: 18px;
+    }
+    .bold { font-weight: bold; }
+    tspan {
+      font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+      white-space: pre;
+      line-height: 18px;
+    }
+  </style>
+
+  <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
+
+  <text xml:space="preserve" class="container fg">
+    <tspan x="10px" y="28px"><tspan class="fg-bright-red bold">error[E0027]</tspan><tspan>: </tspan><tspan class="bold">pattern does not mention fields `lineno`, `content`</tspan>
+</tspan>
+    <tspan x="10px" y="46px"><tspan>   </tspan><tspan class="fg-bright-blue bold">--&gt;</tspan><tspan> src/display_list.rs:139:32</tspan>
+</tspan>
+    <tspan x="10px" y="64px"><tspan>    </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="82px"><tspan class="fg-bright-blue bold">139 |</tspan><tspan>                           if let DisplayLine::Source {</tspan>
+</tspan>
+    <tspan x="10px" y="100px"><tspan>    </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>  </tspan><tspan class="fg-bright-red bold">________________________________^</tspan>
+</tspan>
+    <tspan x="10px" y="118px"><tspan class="fg-bright-blue bold">140 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>                             ref mut inline_marks,</tspan>
+</tspan>
+    <tspan x="10px" y="136px"><tspan class="fg-bright-blue bold">141 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>                         } = body[body_idx]</tspan>
+</tspan>
+    <tspan x="10px" y="154px"><tspan>    </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|_________________________^</tspan><tspan> </tspan><tspan class="fg-bright-red bold">missing fields `lineno`, `content`</tspan>
+</tspan>
+    <tspan x="10px" y="172px"><tspan>    </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+  </text>
+
+</svg>
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/ann_multiline.toml
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/ann_multiline.toml
@ -0,0 +1,21 @@
+[message]
+level = "Error"
+id = "E0027"
+title = "pattern does not mention fields `lineno`, `content`"
+
+[[message.snippets]]
+source = """
+                        if let DisplayLine::Source {
+                            ref mut inline_marks,
+                        } = body[body_idx]
+"""
+line_start = 139
+origin = "src/display_list.rs"
+fold = false
+[[message.snippets.annotations]]
+label = "missing fields `lineno`, `content`"
+level = "Error"
+range = [31, 128]
+
+[renderer]
+color = true
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/ann_multiline2.svg
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/ann_multiline2.svg
@ -0,0 +1,40 @@
+<svg width="740px" height="164px" xmlns="http://www.w3.org/2000/svg">
+  <style>
+    .fg { fill: #AAAAAA }
+    .bg { background: #000000 }
+    .fg-bright-blue { fill: #5555FF }
+    .fg-bright-red { fill: #FF5555 }
+    .container {
+      padding: 0 10px;
+      line-height: 18px;
+    }
+    .bold { font-weight: bold; }
+    tspan {
+      font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+      white-space: pre;
+      line-height: 18px;
+    }
+  </style>
+
+  <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
+
+  <text xml:space="preserve" class="container fg">
+    <tspan x="10px" y="28px"><tspan class="fg-bright-red bold">error[E####]</tspan><tspan>: </tspan><tspan class="bold">spacing error found</tspan>
+</tspan>
+    <tspan x="10px" y="46px"><tspan>  </tspan><tspan class="fg-bright-blue bold">--&gt;</tspan><tspan> foo.txt:26:12</tspan>
+</tspan>
+    <tspan x="10px" y="64px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="82px"><tspan class="fg-bright-blue bold">26 |</tspan><tspan> This is an example</tspan>
+</tspan>
+    <tspan x="10px" y="100px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>            </tspan><tspan class="fg-bright-red bold">^^^^^^^</tspan><tspan> </tspan><tspan class="fg-bright-red bold">this should not be on separate lines</tspan>
+</tspan>
+    <tspan x="10px" y="118px"><tspan class="fg-bright-blue bold">27 |</tspan><tspan> of an edge case of an annotation overflowing</tspan>
+</tspan>
+    <tspan x="10px" y="136px"><tspan class="fg-bright-blue bold">28 |</tspan><tspan> to exactly one character on next line.</tspan>
+</tspan>
+    <tspan x="10px" y="154px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+  </text>
+
+</svg>
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/ann_multiline2.toml
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/ann_multiline2.toml
@ -0,0 +1,21 @@
+[message]
+level = "Error"
+id = "E####"
+title = "spacing error found"
+
+[[message.snippets]]
+source = """
+This is an example
+of an edge case of an annotation overflowing
+to exactly one character on next line.
+"""
+line_start = 26
+origin = "foo.txt"
+fold = false
+[[message.snippets.annotations]]
+label = "this should not be on separate lines"
+level = "Error"
+range = [11, 19]
+
+[renderer]
+color = true
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/ann_removed_nl.svg
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/ann_removed_nl.svg
@ -0,0 +1,36 @@
+<svg width="740px" height="128px" xmlns="http://www.w3.org/2000/svg">
+  <style>
+    .fg { fill: #AAAAAA }
+    .bg { background: #000000 }
+    .fg-bright-blue { fill: #5555FF }
+    .fg-bright-red { fill: #FF5555 }
+    .container {
+      padding: 0 10px;
+      line-height: 18px;
+    }
+    .bold { font-weight: bold; }
+    tspan {
+      font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+      white-space: pre;
+      line-height: 18px;
+    }
+  </style>
+
+  <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
+
+  <text xml:space="preserve" class="container fg">
+    <tspan x="10px" y="28px"><tspan class="fg-bright-red bold">error</tspan><tspan>: </tspan><tspan class="bold">expected `.`, `=`</tspan>
+</tspan>
+    <tspan x="10px" y="46px"><tspan> </tspan><tspan class="fg-bright-blue bold">--&gt;</tspan><tspan> Cargo.toml:1:5</tspan>
+</tspan>
+    <tspan x="10px" y="64px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="82px"><tspan class="fg-bright-blue bold">1 |</tspan><tspan> asdf</tspan>
+</tspan>
+    <tspan x="10px" y="100px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>     </tspan><tspan class="fg-bright-red bold">^</tspan>
+</tspan>
+    <tspan x="10px" y="118px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+  </text>
+
+</svg>
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/ann_removed_nl.toml
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/ann_removed_nl.toml
@ -0,0 +1,15 @@
+[message]
+level = "Error"
+title = "expected `.`, `=`"
+
+[[message.snippets]]
+source = "asdf"
+line_start = 1
+origin = "Cargo.toml"
+[[message.snippets.annotations]]
+label = ""
+level = "Error"
+range = [4, 5]
+
+[renderer]
+color = true
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/ensure-emoji-highlight-width.svg
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/ensure-emoji-highlight-width.svg
@ -0,0 +1,36 @@
+<svg width="1356px" height="128px" xmlns="http://www.w3.org/2000/svg">
+  <style>
+    .fg { fill: #AAAAAA }
+    .bg { background: #000000 }
+    .fg-bright-blue { fill: #5555FF }
+    .fg-bright-red { fill: #FF5555 }
+    .container {
+      padding: 0 10px;
+      line-height: 18px;
+    }
+    .bold { font-weight: bold; }
+    tspan {
+      font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+      white-space: pre;
+      line-height: 18px;
+    }
+  </style>
+
+  <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
+
+  <text xml:space="preserve" class="container fg">
+    <tspan x="10px" y="28px"><tspan class="fg-bright-red bold">error</tspan><tspan>: </tspan><tspan class="bold">invalid character ` ` in package name: `haha this isn't a valid name 🐛`, characters must be Unicode XID characters (numbers, `-`, `_`, or most letters)</tspan>
+</tspan>
+    <tspan x="10px" y="46px"><tspan> </tspan><tspan class="fg-bright-blue bold">--&gt;</tspan><tspan> &lt;file&gt;:7:1</tspan>
+</tspan>
+    <tspan x="10px" y="64px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="82px"><tspan class="fg-bright-blue bold">7 |</tspan><tspan> "haha this isn't a valid name 🐛" = { package = "libc", version = "0.1" }</tspan>
+</tspan>
+    <tspan x="10px" y="100px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan> </tspan><tspan class="fg-bright-red bold">^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^</tspan>
+</tspan>
+    <tspan x="10px" y="118px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+  </text>
+
+</svg>
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/ensure-emoji-highlight-width.toml
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/ensure-emoji-highlight-width.toml
@ -0,0 +1,18 @@
+[message]
+title = "invalid character ` ` in package name: `haha this isn't a valid name 🐛`, characters must be Unicode XID characters (numbers, `-`, `_`, or most letters)"
+level = "Error"
+
+
+[[message.snippets]]
+source = """
+"haha this isn't a valid name 🐛" = { package = "libc", version = "0.1" }
+"""
+line_start = 7
+origin = "<file>"
+[[message.snippets.annotations]]
+label = ""
+level = "Error"
+range = [0, 35]
+
+[renderer]
+color = true
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/fold_ann_multiline.svg
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/fold_ann_multiline.svg
@ -0,0 +1,49 @@
+<svg width="869px" height="236px" xmlns="http://www.w3.org/2000/svg">
+  <style>
+    .fg { fill: #AAAAAA }
+    .bg { background: #000000 }
+    .fg-bright-blue { fill: #5555FF }
+    .fg-bright-red { fill: #FF5555 }
+    .fg-yellow { fill: #AA5500 }
+    .container {
+      padding: 0 10px;
+      line-height: 18px;
+    }
+    .bold { font-weight: bold; }
+    tspan {
+      font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+      white-space: pre;
+      line-height: 18px;
+    }
+  </style>
+
+  <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
+
+  <text xml:space="preserve" class="container fg">
+    <tspan x="10px" y="28px"><tspan class="fg-bright-red bold">error[E0308]</tspan><tspan>: </tspan><tspan class="bold">mismatched types</tspan>
+</tspan>
+    <tspan x="10px" y="46px"><tspan>  </tspan><tspan class="fg-bright-blue bold">--&gt;</tspan><tspan> src/format.rs:51:6</tspan>
+</tspan>
+    <tspan x="10px" y="64px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="82px"><tspan class="fg-bright-blue bold">51 |</tspan><tspan>   ) -&gt; Option&lt;String&gt; {</tspan>
+</tspan>
+    <tspan x="10px" y="100px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>        </tspan><tspan class="fg-yellow bold">--------------</tspan><tspan> </tspan><tspan class="fg-yellow bold">expected `std::option::Option&lt;std::string::String&gt;` because of return type</tspan>
+</tspan>
+    <tspan x="10px" y="118px"><tspan class="fg-bright-blue bold">52 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">/</tspan><tspan>     for ann in annotations {</tspan>
+</tspan>
+    <tspan x="10px" y="136px"><tspan class="fg-bright-blue bold">53 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>         match (ann.range.0, ann.range.1) {</tspan>
+</tspan>
+    <tspan x="10px" y="154px"><tspan class="fg-bright-blue bold">...</tspan><tspan>  </tspan><tspan class="fg-bright-red bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="172px"><tspan class="fg-bright-blue bold">71 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>         }</tspan>
+</tspan>
+    <tspan x="10px" y="190px"><tspan class="fg-bright-blue bold">72 |</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|</tspan><tspan>     }</tspan>
+</tspan>
+    <tspan x="10px" y="208px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan> </tspan><tspan class="fg-bright-red bold">|_____^</tspan><tspan> </tspan><tspan class="fg-bright-red bold">expected enum `std::option::Option`, found ()</tspan>
+</tspan>
+    <tspan x="10px" y="226px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+  </text>
+
+</svg>
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/fold_ann_multiline.toml
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/fold_ann_multiline.toml
@ -0,0 +1,44 @@
+[message]
+level = "Error"
+id = "E0308"
+title = "mismatched types"
+
+[[message.snippets]]
+source = """
+) -> Option<String> {
+    for ann in annotations {
+        match (ann.range.0, ann.range.1) {
+            (None, None) => continue,
+            (Some(start), Some(end)) if start > end_index || end < start_index => continue,
+            (Some(start), Some(end)) if start >= start_index && end <= end_index => {
+                let label = if let Some(ref label) = ann.label {
+                    format!(" {}", label)
+                } else {
+                    String::from("")
+                };
+
+                return Some(format!(
+                    "{}{}{}",
+                    " ".repeat(start - start_index),
+                    "^".repeat(end - start),
+                    label
+                ));
+            }
+            _ => continue,
+        }
+    }
+"""
+line_start = 51
+origin = "src/format.rs"
+fold = true
+[[message.snippets.annotations]]
+label = "expected `std::option::Option<std::string::String>` because of return type"
+level = "Warning"
+range = [5, 19]
+[[message.snippets.annotations]]
+label = "expected enum `std::option::Option`, found ()"
+level = "Error"
+range = [22, 766]
+
+[renderer]
+color = true
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/fold_bad_origin_line.svg
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/fold_bad_origin_line.svg
@ -0,0 +1,37 @@
+<svg width="740px" height="128px" xmlns="http://www.w3.org/2000/svg">
+  <style>
+    .fg { fill: #AAAAAA }
+    .bg { background: #000000 }
+    .fg-bright-blue { fill: #5555FF }
+    .fg-bright-red { fill: #FF5555 }
+    .fg-yellow { fill: #AA5500 }
+    .container {
+      padding: 0 10px;
+      line-height: 18px;
+    }
+    .bold { font-weight: bold; }
+    tspan {
+      font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+      white-space: pre;
+      line-height: 18px;
+    }
+  </style>
+
+  <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
+
+  <text xml:space="preserve" class="container fg">
+    <tspan x="10px" y="28px"><tspan class="fg-bright-red bold">error</tspan>
+</tspan>
+    <tspan x="10px" y="46px"><tspan> </tspan><tspan class="fg-bright-blue bold">--&gt;</tspan><tspan> path/to/error.rs:3:1</tspan>
+</tspan>
+    <tspan x="10px" y="64px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="82px"><tspan class="fg-bright-blue bold">3 |</tspan><tspan> invalid syntax</tspan>
+</tspan>
+    <tspan x="10px" y="100px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan> </tspan><tspan class="fg-yellow bold">--------------</tspan><tspan> </tspan><tspan class="fg-yellow bold">error here</tspan>
+</tspan>
+    <tspan x="10px" y="118px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+  </text>
+
+</svg>
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/fold_bad_origin_line.toml
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/fold_bad_origin_line.toml
@ -0,0 +1,20 @@
+[message]
+level = "Error"
+title = ""
+
+[[message.snippets]]
+source = """
+
+
+invalid syntax
+"""
+line_start = 1
+origin = "path/to/error.rs"
+fold = true
+[[message.snippets.annotations]]
+label = "error here"
+level = "Warning"
+range = [2,16]
+
+[renderer]
+color = true
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/fold_leading.svg
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/fold_leading.svg
@ -0,0 +1,36 @@
+<svg width="740px" height="128px" xmlns="http://www.w3.org/2000/svg">
+  <style>
+    .fg { fill: #AAAAAA }
+    .bg { background: #000000 }
+    .fg-bright-blue { fill: #5555FF }
+    .fg-bright-red { fill: #FF5555 }
+    .container {
+      padding: 0 10px;
+      line-height: 18px;
+    }
+    .bold { font-weight: bold; }
+    tspan {
+      font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+      white-space: pre;
+      line-height: 18px;
+    }
+  </style>
+
+  <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
+
+  <text xml:space="preserve" class="container fg">
+    <tspan x="10px" y="28px"><tspan class="fg-bright-red bold">error[E0308]</tspan><tspan>: </tspan><tspan class="bold">invalid type: integer `20`, expected a bool</tspan>
+</tspan>
+    <tspan x="10px" y="46px"><tspan>  </tspan><tspan class="fg-bright-blue bold">--&gt;</tspan><tspan> Cargo.toml:11:13</tspan>
+</tspan>
+    <tspan x="10px" y="64px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="82px"><tspan class="fg-bright-blue bold">11 |</tspan><tspan> workspace = 20</tspan>
+</tspan>
+    <tspan x="10px" y="100px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>             </tspan><tspan class="fg-bright-red bold">^^</tspan>
+</tspan>
+    <tspan x="10px" y="118px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+  </text>
+
+</svg>
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/fold_leading.toml
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/fold_leading.toml
@ -0,0 +1,29 @@
+[message]
+level = "Error"
+id = "E0308"
+title = "invalid type: integer `20`, expected a bool"
+
+[[message.snippets]]
+source = """
+[workspace]
+
+[package]
+name = "hello"
+version = "1.0.0"
+license = "MIT"
+rust-version = "1.70"
+edition = "2021"
+
+[lints]
+workspace = 20
+"""
+line_start = 1
+origin = "Cargo.toml"
+fold = true
+[[message.snippets.annotations]]
+label = ""
+level = "Error"
+range = [132, 134]
+
+[renderer]
+color = true
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/fold_trailing.svg
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/fold_trailing.svg
@ -0,0 +1,36 @@
+<svg width="740px" height="128px" xmlns="http://www.w3.org/2000/svg">
+  <style>
+    .fg { fill: #AAAAAA }
+    .bg { background: #000000 }
+    .fg-bright-blue { fill: #5555FF }
+    .fg-bright-red { fill: #FF5555 }
+    .container {
+      padding: 0 10px;
+      line-height: 18px;
+    }
+    .bold { font-weight: bold; }
+    tspan {
+      font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+      white-space: pre;
+      line-height: 18px;
+    }
+  </style>
+
+  <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
+
+  <text xml:space="preserve" class="container fg">
+    <tspan x="10px" y="28px"><tspan class="fg-bright-red bold">error[E0308]</tspan><tspan>: </tspan><tspan class="bold">invalid type: integer `20`, expected a lints table</tspan>
+</tspan>
+    <tspan x="10px" y="46px"><tspan> </tspan><tspan class="fg-bright-blue bold">--&gt;</tspan><tspan> Cargo.toml:1:9</tspan>
+</tspan>
+    <tspan x="10px" y="64px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="82px"><tspan class="fg-bright-blue bold">1 |</tspan><tspan> lints = 20</tspan>
+</tspan>
+    <tspan x="10px" y="100px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>         </tspan><tspan class="fg-bright-red bold">^^</tspan>
+</tspan>
+    <tspan x="10px" y="118px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+  </text>
+
+</svg>
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/fold_trailing.toml
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/fold_trailing.toml
@ -0,0 +1,28 @@
+[message]
+level = "Error"
+id = "E0308"
+title = "invalid type: integer `20`, expected a lints table"
+
+[[message.snippets]]
+source = """
+lints = 20
+
+[workspace]
+
+[package]
+name = "hello"
+version = "1.0.0"
+license = "MIT"
+rust-version = "1.70"
+edition = "2021"
+"""
+line_start = 1
+origin = "Cargo.toml"
+fold = true
+[[message.snippets.annotations]]
+label = ""
+level = "Error"
+range = [8, 10]
+
+[renderer]
+color = true
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/issue_9.svg
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/issue_9.svg
@ -0,0 +1,49 @@
+<svg width="911px" height="236px" xmlns="http://www.w3.org/2000/svg">
+  <style>
+    .fg { fill: #AAAAAA }
+    .bg { background: #000000 }
+    .fg-bright-blue { fill: #5555FF }
+    .fg-bright-red { fill: #FF5555 }
+    .fg-yellow { fill: #AA5500 }
+    .container {
+      padding: 0 10px;
+      line-height: 18px;
+    }
+    .bold { font-weight: bold; }
+    tspan {
+      font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+      white-space: pre;
+      line-height: 18px;
+    }
+  </style>
+
+  <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
+
+  <text xml:space="preserve" class="container fg">
+    <tspan x="10px" y="28px"><tspan class="fg-bright-red bold">error</tspan><tspan>: </tspan><tspan class="bold">expected one of `.`, `;`, `?`, or an operator, found `for`</tspan>
+</tspan>
+    <tspan x="10px" y="46px"><tspan> </tspan><tspan class="fg-bright-blue bold">--&gt;</tspan><tspan> /code/rust/src/test/ui/annotate-snippet/suggestion.rs:4:5</tspan>
+</tspan>
+    <tspan x="10px" y="64px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="82px"><tspan class="fg-bright-blue bold">4 |</tspan><tspan> let x = vec![1];</tspan>
+</tspan>
+    <tspan x="10px" y="100px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>     </tspan><tspan class="fg-yellow bold">-</tspan><tspan> </tspan><tspan class="fg-yellow bold">move occurs because `x` has type `std::vec::Vec&lt;i32&gt;`, which does not implement the `Copy` trait</tspan>
+</tspan>
+    <tspan x="10px" y="118px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="136px"><tspan class="fg-bright-blue bold">7 |</tspan><tspan> let y = x;</tspan>
+</tspan>
+    <tspan x="10px" y="154px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>         </tspan><tspan class="fg-yellow bold">-</tspan><tspan> </tspan><tspan class="fg-yellow bold">value moved here</tspan>
+</tspan>
+    <tspan x="10px" y="172px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="190px"><tspan class="fg-bright-blue bold">9 |</tspan><tspan> x;</tspan>
+</tspan>
+    <tspan x="10px" y="208px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan> </tspan><tspan class="fg-bright-red bold">^</tspan><tspan> </tspan><tspan class="fg-bright-red bold">value used here after move</tspan>
+</tspan>
+    <tspan x="10px" y="226px"><tspan>  </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+  </text>
+
+</svg>
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/issue_9.toml
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/issue_9.toml
@ -0,0 +1,31 @@
+[message]
+level = "Error"
+title = "expected one of `.`, `;`, `?`, or an operator, found `for`"
+
+[[message.snippets]]
+source = "let x = vec![1];"
+line_start = 4
+origin = "/code/rust/src/test/ui/annotate-snippet/suggestion.rs"
+[[message.snippets.annotations]]
+label = "move occurs because `x` has type `std::vec::Vec<i32>`, which does not implement the `Copy` trait"
+level = "Warning"
+range = [4, 5]
+
+[[message.snippets]]
+source = "let y = x;"
+line_start = 7
+[[message.snippets.annotations]]
+label = "value moved here"
+level = "Warning"
+range = [8, 9]
+
+[[message.snippets]]
+source = "x;"
+line_start = 9
+[[message.snippets.annotations]]
+label = "value used here after move"
+level = "Error"
+range = [0, 1]
+
+[renderer]
+color = true
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/multiple_annotations.svg
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/multiple_annotations.svg
@ -0,0 +1,54 @@
+<svg width="768px" height="290px" xmlns="http://www.w3.org/2000/svg">
+  <style>
+    .fg { fill: #AAAAAA }
+    .bg { background: #000000 }
+    .fg-bright-blue { fill: #5555FF }
+    .fg-bright-red { fill: #FF5555 }
+    .container {
+      padding: 0 10px;
+      line-height: 18px;
+    }
+    .bold { font-weight: bold; }
+    tspan {
+      font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+      white-space: pre;
+      line-height: 18px;
+    }
+  </style>
+
+  <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
+
+  <text xml:space="preserve" class="container fg">
+    <tspan x="10px" y="28px"><tspan class="fg-bright-red bold">error</tspan>
+</tspan>
+    <tspan x="10px" y="46px"><tspan>    </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="64px"><tspan class="fg-bright-blue bold"> 96 |</tspan><tspan> fn add_title_line(result: &amp;mut Vec&lt;String&gt;, main_annotation: Option&lt;&amp;Annotation&gt;) {</tspan>
+</tspan>
+    <tspan x="10px" y="82px"><tspan class="fg-bright-blue bold"> 97 |</tspan><tspan>     if let Some(annotation) = main_annotation {</tspan>
+</tspan>
+    <tspan x="10px" y="100px"><tspan>    </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>                 </tspan><tspan class="fg-bright-red bold">^^^^^^^^^^</tspan><tspan> </tspan><tspan class="fg-bright-red bold">Variable defined here</tspan>
+</tspan>
+    <tspan x="10px" y="118px"><tspan class="fg-bright-blue bold"> 98 |</tspan><tspan>         result.push(format_title_line(</tspan>
+</tspan>
+    <tspan x="10px" y="136px"><tspan class="fg-bright-blue bold"> 99 |</tspan><tspan>             &amp;annotation.annotation_type,</tspan>
+</tspan>
+    <tspan x="10px" y="154px"><tspan>    </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>              </tspan><tspan class="fg-bright-red bold">^^^^^^^^^^</tspan><tspan> </tspan><tspan class="fg-bright-red bold">Referenced here</tspan>
+</tspan>
+    <tspan x="10px" y="172px"><tspan class="fg-bright-blue bold">100 |</tspan><tspan>             None,</tspan>
+</tspan>
+    <tspan x="10px" y="190px"><tspan class="fg-bright-blue bold">101 |</tspan><tspan>             &amp;annotation.label,</tspan>
+</tspan>
+    <tspan x="10px" y="208px"><tspan>    </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>              </tspan><tspan class="fg-bright-red bold">^^^^^^^^^^</tspan><tspan> </tspan><tspan class="fg-bright-red bold">Referenced again here</tspan>
+</tspan>
+    <tspan x="10px" y="226px"><tspan class="fg-bright-blue bold">102 |</tspan><tspan>         ));</tspan>
+</tspan>
+    <tspan x="10px" y="244px"><tspan class="fg-bright-blue bold">103 |</tspan><tspan>     }</tspan>
+</tspan>
+    <tspan x="10px" y="262px"><tspan class="fg-bright-blue bold">104 |</tspan><tspan> }</tspan>
+</tspan>
+    <tspan x="10px" y="280px"><tspan>    </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+  </text>
+
+</svg>
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/multiple_annotations.toml
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/multiple_annotations.toml
@ -0,0 +1,32 @@
+[message]
+level = "Error"
+title = ""
+
+[[message.snippets]]
+source = """
+fn add_title_line(result: &mut Vec<String>, main_annotation: Option<&Annotation>) {
+    if let Some(annotation) = main_annotation {
+        result.push(format_title_line(
+            &annotation.annotation_type,
+            None,
+            &annotation.label,
+        ));
+    }
+}
+"""
+line_start = 96
+[[message.snippets.annotations]]
+label = "Variable defined here"
+level = "Error"
+range = [100, 110]
+[[message.snippets.annotations]]
+label = "Referenced here"
+level = "Error"
+range = [184, 194]
+[[message.snippets.annotations]]
+label = "Referenced again here"
+level = "Error"
+range = [243, 253]
+
+[renderer]
+color = true
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/simple.svg
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/simple.svg
@ -0,0 +1,43 @@
+<svg width="740px" height="182px" xmlns="http://www.w3.org/2000/svg">
+  <style>
+    .fg { fill: #AAAAAA }
+    .bg { background: #000000 }
+    .fg-bright-blue { fill: #5555FF }
+    .fg-bright-red { fill: #FF5555 }
+    .fg-yellow { fill: #AA5500 }
+    .container {
+      padding: 0 10px;
+      line-height: 18px;
+    }
+    .bold { font-weight: bold; }
+    tspan {
+      font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+      white-space: pre;
+      line-height: 18px;
+    }
+  </style>
+
+  <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
+
+  <text xml:space="preserve" class="container fg">
+    <tspan x="10px" y="28px"><tspan class="fg-bright-red bold">error</tspan><tspan>: </tspan><tspan class="bold">expected one of `.`, `;`, `?`, or an operator, found `for`</tspan>
+</tspan>
+    <tspan x="10px" y="46px"><tspan>   </tspan><tspan class="fg-bright-blue bold">--&gt;</tspan><tspan> src/format_color.rs:171:9</tspan>
+</tspan>
+    <tspan x="10px" y="64px"><tspan>    </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="82px"><tspan class="fg-bright-blue bold">169 |</tspan><tspan>         })</tspan>
+</tspan>
+    <tspan x="10px" y="100px"><tspan>    </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>           </tspan><tspan class="fg-yellow bold">-</tspan><tspan> </tspan><tspan class="fg-yellow bold">expected one of `.`, `;`, `?`, or an operator here</tspan>
+</tspan>
+    <tspan x="10px" y="118px"><tspan class="fg-bright-blue bold">170 |</tspan>
+</tspan>
+    <tspan x="10px" y="136px"><tspan class="fg-bright-blue bold">171 |</tspan><tspan>         for line in &amp;self.body {</tspan>
+</tspan>
+    <tspan x="10px" y="154px"><tspan>    </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>         </tspan><tspan class="fg-bright-red bold">^^^</tspan><tspan> </tspan><tspan class="fg-bright-red bold">unexpected token</tspan>
+</tspan>
+    <tspan x="10px" y="172px"><tspan>    </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+  </text>
+
+</svg>
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/simple.toml
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/simple.toml
@ -0,0 +1,22 @@
+[message]
+level = "Error"
+title = "expected one of `.`, `;`, `?`, or an operator, found `for`"
+
+[[message.snippets]]
+source = """
+        })
+
+        for line in &self.body {"""
+line_start = 169
+origin = "src/format_color.rs"
+[[message.snippets.annotations]]
+label = "unexpected token"
+level = "Error"
+range = [20, 23]
+[[message.snippets.annotations]]
+label = "expected one of `.`, `;`, `?`, or an operator here"
+level = "Warning"
+range = [10, 11]
+
+[renderer]
+color = true
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/strip_line.svg
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/strip_line.svg
@ -0,0 +1,36 @@
+<svg width="740px" height="128px" xmlns="http://www.w3.org/2000/svg">
+  <style>
+    .fg { fill: #AAAAAA }
+    .bg { background: #000000 }
+    .fg-bright-blue { fill: #5555FF }
+    .fg-bright-red { fill: #FF5555 }
+    .container {
+      padding: 0 10px;
+      line-height: 18px;
+    }
+    .bold { font-weight: bold; }
+    tspan {
+      font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+      white-space: pre;
+      line-height: 18px;
+    }
+  </style>
+
+  <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
+
+  <text xml:space="preserve" class="container fg">
+    <tspan x="10px" y="28px"><tspan class="fg-bright-red bold">error[E0308]</tspan><tspan>: </tspan><tspan class="bold">mismatched types</tspan>
+</tspan>
+    <tspan x="10px" y="46px"><tspan>  </tspan><tspan class="fg-bright-blue bold">--&gt;</tspan><tspan> $DIR/whitespace-trimming.rs:4:193</tspan>
+</tspan>
+    <tspan x="10px" y="64px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="82px"><tspan class="fg-bright-blue bold">LL |</tspan><tspan> </tspan><tspan class="fg-bright-blue bold">...</tspan><tspan>                   let _: () = 42;</tspan>
+</tspan>
+    <tspan x="10px" y="100px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>                                   </tspan><tspan class="fg-bright-red bold">^^</tspan><tspan> </tspan><tspan class="fg-bright-red bold">expected (), found integer</tspan>
+</tspan>
+    <tspan x="10px" y="118px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+  </text>
+
+</svg>
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/strip_line.toml
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/strip_line.toml
@ -0,0 +1,18 @@
+[message]
+level = "Error"
+id = "E0308"
+title = "mismatched types"
+
+[[message.snippets]]
+source = "                                                                                                                                                                                    let _: () = 42;"
+line_start = 4
+origin = "$DIR/whitespace-trimming.rs"
+
+[[message.snippets.annotations]]
+label = "expected (), found integer"
+level = "Error"
+range = [192, 194]
+
+[renderer]
+color = true
+anonymized_line_numbers = true
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/strip_line_char.svg
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/strip_line_char.svg
@ -0,0 +1,36 @@
+<svg width="740px" height="128px" xmlns="http://www.w3.org/2000/svg">
+  <style>
+    .fg { fill: #AAAAAA }
+    .bg { background: #000000 }
+    .fg-bright-blue { fill: #5555FF }
+    .fg-bright-red { fill: #FF5555 }
+    .container {
+      padding: 0 10px;
+      line-height: 18px;
+    }
+    .bold { font-weight: bold; }
+    tspan {
+      font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+      white-space: pre;
+      line-height: 18px;
+    }
+  </style>
+
+  <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
+
+  <text xml:space="preserve" class="container fg">
+    <tspan x="10px" y="28px"><tspan class="fg-bright-red bold">error[E0308]</tspan><tspan>: </tspan><tspan class="bold">mismatched types</tspan>
+</tspan>
+    <tspan x="10px" y="46px"><tspan>  </tspan><tspan class="fg-bright-blue bold">--&gt;</tspan><tspan> $DIR/whitespace-trimming.rs:4:193</tspan>
+</tspan>
+    <tspan x="10px" y="64px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="82px"><tspan class="fg-bright-blue bold">LL |</tspan><tspan> </tspan><tspan class="fg-bright-blue bold">...</tspan><tspan>                   let _: () = 42ñ</tspan>
+</tspan>
+    <tspan x="10px" y="100px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>                                   </tspan><tspan class="fg-bright-red bold">^^</tspan><tspan> </tspan><tspan class="fg-bright-red bold">expected (), found integer</tspan>
+</tspan>
+    <tspan x="10px" y="118px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+  </text>
+
+</svg>
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/strip_line_char.toml
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/strip_line_char.toml
@ -0,0 +1,18 @@
+[message]
+level = "Error"
+id = "E0308"
+title = "mismatched types" 
+
+[[message.snippets]]
+source = "                                                                                                                                                                                    let _: () = 42ñ"
+line_start = 4
+origin = "$DIR/whitespace-trimming.rs"
+
+[[message.snippets.annotations]]
+label = "expected (), found integer"
+level = "Error"
+range = [192, 194]
+
+[renderer]
+color = true
+anonymized_line_numbers = true
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/strip_line_non_ws.svg
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/strip_line_non_ws.svg
@ -0,0 +1,40 @@
+<svg width="1196px" height="164px" xmlns="http://www.w3.org/2000/svg">
+  <style>
+    .fg { fill: #AAAAAA }
+    .bg { background: #000000 }
+    .fg-bright-blue { fill: #5555FF }
+    .fg-bright-red { fill: #FF5555 }
+    .container {
+      padding: 0 10px;
+      line-height: 18px;
+    }
+    .bold { font-weight: bold; }
+    tspan {
+      font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+      white-space: pre;
+      line-height: 18px;
+    }
+  </style>
+
+  <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
+
+  <text xml:space="preserve" class="container fg">
+    <tspan x="10px" y="28px"><tspan class="fg-bright-red bold">error[E0308]</tspan><tspan>: </tspan><tspan class="bold">mismatched types</tspan>
+</tspan>
+    <tspan x="10px" y="46px"><tspan>  </tspan><tspan class="fg-bright-blue bold">--&gt;</tspan><tspan> $DIR/non-whitespace-trimming.rs:4:242</tspan>
+</tspan>
+    <tspan x="10px" y="64px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="82px"><tspan class="fg-bright-blue bold">LL |</tspan><tspan> </tspan><tspan class="fg-bright-blue bold">...</tspan><tspan> = (); let _: () = (); let _: () = (); let _: () = 42; let _: () = (); let _: () = (); let _: () = (); let _: () = (); let _: () </tspan><tspan class="fg-bright-blue bold">...</tspan>
+</tspan>
+    <tspan x="10px" y="100px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>                                                  </tspan><tspan class="fg-bright-red bold">^^</tspan><tspan>   </tspan><tspan class="fg-bright-red bold">^^</tspan><tspan> </tspan><tspan class="fg-bright-red bold">expected `()`, found integer</tspan>
+</tspan>
+    <tspan x="10px" y="118px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>                                                  </tspan><tspan class="fg-bright-red bold">|</tspan>
+</tspan>
+    <tspan x="10px" y="136px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan><tspan>                                                  </tspan><tspan class="fg-bright-red bold">expected due to this</tspan>
+</tspan>
+    <tspan x="10px" y="154px"><tspan>   </tspan><tspan class="fg-bright-blue bold">|</tspan>
+</tspan>
+  </text>
+
+</svg>
--- a/crates/ruff_annotate_snippets/tests/fixtures/color/strip_line_non_ws.toml
+++ b/crates/ruff_annotate_snippets/tests/fixtures/color/strip_line_non_ws.toml
@ -0,0 +1,26 @@
+[message]
+level = "Error"
+id = "E0308"
+title = "mismatched types"
+
+[[message.snippets]]
+source = """
+	let _: () = (); let _: () = (); let _: () = (); let _: () = (); let _: () = (); let _: () = (); let _: () = (); let _: () = (); let _: () = (); let _: () = (); let _: () = (); let _: () = (); let _: () = (); let _: () = (); let _: () = 42; let _: () = (); let _: () = (); let _: () = (); let _: () = (); let _: () = (); let _: () = (); let _: () = (); let _: () = ();
+"""
+line_start = 4
+origin = "$DIR/non-whitespace-trimming.rs"
+
+[[message.snippets.annotations]]
+label = "expected `()`, found integer"
+level = "Error"
+range = [241, 243]
+
+[[message.snippets.annotations]]
+label = "expected due to this"
+level = "Error"
+range = [236, 238]
+
+
+[renderer]
+anonymized_line_numbers = true
+color = true
--- a/crates/ruff_annotate_snippets/tests/fixtures/deserialize.rs
+++ b/crates/ruff_annotate_snippets/tests/fixtures/deserialize.rs
@ -0,0 +1,130 @@
+use serde::Deserialize;
+use std::ops::Range;
+
+use ruff_annotate_snippets::renderer::DEFAULT_TERM_WIDTH;
+use ruff_annotate_snippets::{Annotation, Level, Message, Renderer, Snippet};
+
+#[derive(Deserialize)]
+pub(crate) struct Fixture {
+    #[serde(default)]
+    pub(crate) renderer: RendererDef,
+    pub(crate) message: MessageDef,
+}
+
+#[derive(Deserialize)]
+pub struct MessageDef {
+    #[serde(with = "LevelDef")]
+    pub level: Level,
+    pub title: String,
+    #[serde(default)]
+    pub id: Option<String>,
+    #[serde(default)]
+    pub footer: Vec<MessageDef>,
+    pub snippets: Vec<SnippetDef>,
+}
+
+impl<'a> From<&'a MessageDef> for Message<'a> {
+    fn from(val: &'a MessageDef) -> Self {
+        let MessageDef {
+            level,
+            title,
+            id,
+            footer,
+            snippets,
+        } = val;
+        let mut message = level.title(title);
+        if let Some(id) = id {
+            message = message.id(id);
+        }
+        message = message.snippets(snippets.iter().map(Snippet::from));
+        message = message.footers(footer.iter().map(Into::into));
+        message
+    }
+}
+
+#[derive(Deserialize)]
+pub struct SnippetDef {
+    pub source: String,
+    pub line_start: usize,
+    pub origin: Option<String>,
+    pub annotations: Vec<AnnotationDef>,
+    #[serde(default)]
+    pub fold: bool,
+}
+
+impl<'a> From<&'a SnippetDef> for Snippet<'a> {
+    fn from(val: &'a SnippetDef) -> Self {
+        let SnippetDef {
+            source,
+            line_start,
+            origin,
+            annotations,
+            fold,
+        } = val;
+        let mut snippet = Snippet::source(source).line_start(*line_start).fold(*fold);
+        if let Some(origin) = origin {
+            snippet = snippet.origin(origin);
+        }
+        snippet = snippet.annotations(annotations.iter().map(Into::into));
+        snippet
+    }
+}
+
+#[derive(Deserialize)]
+pub struct AnnotationDef {
+    pub range: Range<usize>,
+    pub label: String,
+    #[serde(with = "LevelDef")]
+    pub level: Level,
+}
+
+impl<'a> From<&'a AnnotationDef> for Annotation<'a> {
+    fn from(val: &'a AnnotationDef) -> Self {
+        let AnnotationDef {
+            range,
+            label,
+            level,
+        } = val;
+        level.span(range.start..range.end).label(label)
+    }
+}
+
+#[allow(dead_code)]
+#[derive(Deserialize)]
+#[serde(remote = "Level")]
+enum LevelDef {
+    Error,
+    Warning,
+    Info,
+    Note,
+    Help,
+}
+
+#[derive(Default, Deserialize)]
+pub struct RendererDef {
+    #[serde(default)]
+    anonymized_line_numbers: bool,
+    #[serde(default)]
+    term_width: Option<usize>,
+    #[serde(default)]
+    color: bool,
+}
+
+impl From<RendererDef> for Renderer {
+    fn from(val: RendererDef) -> Self {
+        let RendererDef {
+            anonymized_line_numbers,
+            term_width,
+            color,
+        } = val;
+
+        let renderer = if color {
+            Renderer::styled()
+        } else {
+            Renderer::plain()
+        };
+        renderer
+            .anonymized_line_numbers(anonymized_line_numbers)
+            .term_width(term_width.unwrap_or(DEFAULT_TERM_WIDTH))
+    }
+}
--- a/crates/ruff_annotate_snippets/tests/fixtures/main.rs
+++ b/crates/ruff_annotate_snippets/tests/fixtures/main.rs
@ -0,0 +1,42 @@
+mod deserialize;
+
+use crate::deserialize::Fixture;
+use ruff_annotate_snippets::{Message, Renderer};
+use snapbox::data::DataFormat;
+use snapbox::Data;
+use std::error::Error;
+
+fn main() {
+    #[cfg(not(windows))]
+    tryfn::Harness::new("tests/fixtures/", setup, test)
+        .select(["*/*.toml"])
+        .test();
+}
+
+fn setup(input_path: std::path::PathBuf) -> tryfn::Case {
+    let parent = input_path
+        .parent()
+        .unwrap()
+        .file_name()
+        .unwrap()
+        .to_str()
+        .unwrap();
+    let file_name = input_path.file_name().unwrap().to_str().unwrap();
+    let name = format!("{parent}/{file_name}");
+    let expected = Data::read_from(&input_path.with_extension("svg"), None);
+    tryfn::Case {
+        name,
+        fixture: input_path,
+        expected,
+    }
+}
+
+fn test(input_path: &std::path::Path) -> Result<Data, Box<dyn Error>> {
+    let src = std::fs::read_to_string(input_path)?;
+    let fixture: Fixture = toml::from_str(&src)?;
+    let renderer: Renderer = fixture.renderer.into();
+    let message: Message<'_> = (&fixture.message).into();
+
+    let actual = renderer.render(message).to_string();
+    Ok(Data::from(actual).coerce_to(DataFormat::TermSvg))
+}
--- a/crates/ruff_annotate_snippets/tests/formatter.rs
+++ b/crates/ruff_annotate_snippets/tests/formatter.rs
@ -0,0 +1,963 @@
+// Since this is a vendored copy of `annotate-snippets`, we squash Clippy
+// warnings from upstream in order to the reduce the diff. If our copy drifts
+// far from upstream such that patches become impractical to apply in both
+// places, then we can get rid of these suppressions and fix the lints.
+#![allow(clippy::redundant_clone, clippy::should_panic_without_expect)]
+
+use ruff_annotate_snippets::{Level, Renderer, Snippet};
+
+use snapbox::{assert_data_eq, str};
+
+#[test]
+fn test_i_29() {
+    let snippets = Level::Error.title("oops").snippet(
+        Snippet::source("First line\r\nSecond oops line")
+            .origin("<current file>")
+            .annotation(Level::Error.span(19..23).label("oops"))
+            .fold(true),
+    );
+    let expected = str![[r#"
+error: oops
+ --> <current file>:2:8
+  |
+2 | Second oops line
+  |        ^^^^ oops
+  |
+"#]];
+
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(snippets).to_string(), expected);
+}
+
+#[test]
+fn test_point_to_double_width_characters() {
+    let snippets = Level::Error.title("").snippet(
+        Snippet::source("こんにちは、世界")
+            .origin("<current file>")
+            .annotation(Level::Error.span(18..24).label("world")),
+    );
+
+    let expected = str![[r#"
+error
+ --> <current file>:1:7
+  |
+1 | こんにちは、世界
+  |             ^^^^ world
+  |
+"#]];
+
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(snippets).to_string(), expected);
+}
+
+#[test]
+fn test_point_to_double_width_characters_across_lines() {
+    let snippets = Level::Error.title("").snippet(
+        Snippet::source("おはよう\nございます")
+            .origin("<current file>")
+            .annotation(Level::Error.span(6..22).label("Good morning")),
+    );
+
+    let expected = str![[r#"
+error
+ --> <current file>:1:3
+  |
+1 |   おはよう
+  |  _____^
+2 | | ございます
+  | |______^ Good morning
+  |
+"#]];
+
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(snippets).to_string(), expected);
+}
+
+#[test]
+fn test_point_to_double_width_characters_multiple() {
+    let snippets = Level::Error.title("").snippet(
+        Snippet::source("お寿司\n食べたい🍣")
+            .origin("<current file>")
+            .annotation(Level::Error.span(0..9).label("Sushi1"))
+            .annotation(Level::Note.span(16..22).label("Sushi2")),
+    );
+
+    let expected = str![[r#"
+error
+ --> <current file>:1:1
+  |
+1 | お寿司
+  | ^^^^^^ Sushi1
+2 | 食べたい🍣
+  |     ---- note: Sushi2
+  |
+"#]];
+
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(snippets).to_string(), expected);
+}
+
+#[test]
+fn test_point_to_double_width_characters_mixed() {
+    let snippets = Level::Error.title("").snippet(
+        Snippet::source("こんにちは、新しいWorld！")
+            .origin("<current file>")
+            .annotation(Level::Error.span(18..32).label("New world")),
+    );
+
+    let expected = str![[r#"
+error
+ --> <current file>:1:7
+  |
+1 | こんにちは、新しいWorld！
+  |             ^^^^^^^^^^^ New world
+  |
+"#]];
+
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(snippets).to_string(), expected);
+}
+
+#[test]
+fn test_format_title() {
+    let input = Level::Error.title("This is a title").id("E0001");
+
+    let expected = str![r#"error[E0001]: This is a title"#];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn test_format_snippet_only() {
+    let source = "This is line 1\nThis is line 2";
+    let input = Level::Error
+        .title("")
+        .snippet(Snippet::source(source).line_start(5402));
+
+    let expected = str![[r#"
+error
+     |
+5402 | This is line 1
+5403 | This is line 2
+     |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn test_format_snippets_continuation() {
+    let src_0 = "This is slice 1";
+    let src_1 = "This is slice 2";
+    let input = Level::Error
+        .title("")
+        .snippet(Snippet::source(src_0).line_start(5402).origin("file1.rs"))
+        .snippet(Snippet::source(src_1).line_start(2).origin("file2.rs"));
+    let expected = str![[r#"
+error
+    --> file1.rs
+     |
+5402 | This is slice 1
+     |
+    ::: file2.rs
+     |
+   2 | This is slice 2
+     |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn test_format_snippet_annotation_standalone() {
+    let line_1 = "This is line 1";
+    let line_2 = "This is line 2";
+    let source = [line_1, line_2].join("\n");
+    // In line 2
+    let range = 22..24;
+    let input = Level::Error.title("").snippet(
+        Snippet::source(&source)
+            .line_start(5402)
+            .annotation(Level::Info.span(range.clone()).label("Test annotation")),
+    );
+    let expected = str![[r#"
+error
+     |
+5402 | This is line 1
+5403 | This is line 2
+     |        -- info: Test annotation
+     |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn test_format_footer_title() {
+    let input = Level::Error
+        .title("")
+        .footer(Level::Error.title("This __is__ a title"));
+    let expected = str![[r#"
+error
+ = error: This __is__ a title
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+#[should_panic]
+fn test_i26() {
+    let source = "short";
+    let label = "label";
+    let input = Level::Error.title("").snippet(
+        Snippet::source(source)
+            .line_start(0)
+            .annotation(Level::Error.span(0..source.len() + 2).label(label)),
+    );
+    let renderer = Renderer::plain();
+    let _ = renderer.render(input).to_string();
+}
+
+#[test]
+fn test_source_content() {
+    let source = "This is an example\nof content lines";
+    let input = Level::Error
+        .title("")
+        .snippet(Snippet::source(source).line_start(56));
+    let expected = str![[r#"
+error
+   |
+56 | This is an example
+57 | of content lines
+   |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn test_source_annotation_standalone_singleline() {
+    let source = "tests";
+    let input = Level::Error.title("").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .annotation(Level::Help.span(0..5).label("Example string")),
+    );
+    let expected = str![[r#"
+error
+  |
+1 | tests
+  | ----- help: Example string
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn test_source_annotation_standalone_multiline() {
+    let source = "tests";
+    let input = Level::Error.title("").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .annotation(Level::Help.span(0..5).label("Example string"))
+            .annotation(Level::Help.span(0..5).label("Second line")),
+    );
+    let expected = str![[r#"
+error
+  |
+1 | tests
+  | -----
+  | |
+  | help: Example string
+  | help: Second line
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn test_only_source() {
+    let input = Level::Error
+        .title("")
+        .snippet(Snippet::source("").origin("file.rs"));
+    let expected = str![[r#"
+error
+--> file.rs
+ |
+ |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn test_anon_lines() {
+    let source = "This is an example\nof content lines\n\nabc";
+    let input = Level::Error
+        .title("")
+        .snippet(Snippet::source(source).line_start(56));
+    let expected = str![[r#"
+error
+   |
+LL | This is an example
+LL | of content lines
+LL |
+LL | abc
+   |
+"#]];
+    let renderer = Renderer::plain().anonymized_line_numbers(true);
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn issue_130() {
+    let input = Level::Error.title("dummy").snippet(
+        Snippet::source("foo\nbar\nbaz")
+            .origin("file/path")
+            .line_start(3)
+            .fold(true)
+            .annotation(Level::Error.span(4..11)), // bar\nbaz
+    );
+
+    let expected = str![[r#"
+error: dummy
+ --> file/path:4:1
+  |
+4 | / bar
+5 | | baz
+  | |___^
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn unterminated_string_multiline() {
+    let source = "\
+a\"
+// ...
+";
+    let input = Level::Error.title("").snippet(
+        Snippet::source(source)
+            .origin("file/path")
+            .line_start(3)
+            .fold(true)
+            .annotation(Level::Error.span(0..10)), // 1..10 works
+    );
+    let expected = str![[r#"
+error
+ --> file/path:3:1
+  |
+3 | / a"
+4 | | // ...
+  | |_______^
+  |
+"#]];
+    let renderer = Renderer::plain().anonymized_line_numbers(false);
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn char_and_nl_annotate_char() {
+    let source = "a\r\nb";
+    let input = Level::Error.title("").snippet(
+        Snippet::source(source)
+            .origin("file/path")
+            .line_start(3)
+            .annotation(Level::Error.span(0..2)), // a\r
+    );
+    let expected = str![[r#"
+error
+ --> file/path:3:1
+  |
+3 | a
+  | ^
+4 | b
+  |"#]];
+    let renderer = Renderer::plain().anonymized_line_numbers(false);
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn char_eol_annotate_char() {
+    let source = "a\r\nb";
+    let input = Level::Error.title("").snippet(
+        Snippet::source(source)
+            .origin("file/path")
+            .line_start(3)
+            .annotation(Level::Error.span(0..3)), // a\r\n
+    );
+    let expected = str![[r#"
+error
+ --> file/path:3:1
+  |
+3 | a
+  | ^
+4 | b
+  |"#]];
+    let renderer = Renderer::plain().anonymized_line_numbers(false);
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn char_eol_annotate_char_double_width() {
+    let snippets = Level::Error.title("").snippet(
+        Snippet::source("こん\r\nにちは\r\n世界")
+            .origin("<current file>")
+            .annotation(Level::Error.span(3..8)), // ん\r\n
+    );
+
+    let expected = str![[r#"
+error
+ --> <current file>:1:2
+  |
+1 | こん
+  |   ^^
+2 | にちは
+3 | 世界
+  |
+"#]];
+
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(snippets).to_string(), expected);
+}
+
+#[test]
+fn annotate_eol() {
+    let source = "a\r\nb";
+    let input = Level::Error.title("").snippet(
+        Snippet::source(source)
+            .origin("file/path")
+            .line_start(3)
+            .annotation(Level::Error.span(1..2)), // \r
+    );
+    let expected = str![[r#"
+error
+ --> file/path:3:2
+  |
+3 | a
+  |  ^
+4 | b
+  |"#]];
+    let renderer = Renderer::plain().anonymized_line_numbers(false);
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn annotate_eol2() {
+    let source = "a\r\nb";
+    let input = Level::Error.title("").snippet(
+        Snippet::source(source)
+            .origin("file/path")
+            .line_start(3)
+            .annotation(Level::Error.span(1..3)), // \r\n
+    );
+    let expected = str![[r#"
+error
+ --> file/path:3:2
+  |
+3 | a
+  |  ^
+4 | b
+  |"#]];
+    let renderer = Renderer::plain().anonymized_line_numbers(false);
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn annotate_eol3() {
+    let source = "a\r\nb";
+    let input = Level::Error.title("").snippet(
+        Snippet::source(source)
+            .origin("file/path")
+            .line_start(3)
+            .annotation(Level::Error.span(2..3)), // \n
+    );
+    let expected = str![[r#"
+error
+ --> file/path:3:2
+  |
+3 | a
+  |  ^
+4 | b
+  |"#]];
+    let renderer = Renderer::plain().anonymized_line_numbers(false);
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn annotate_eol4() {
+    let source = "a\r\nb";
+    let input = Level::Error.title("").snippet(
+        Snippet::source(source)
+            .origin("file/path")
+            .line_start(3)
+            .annotation(Level::Error.span(2..2)), // \n
+    );
+    let expected = str![[r#"
+error
+ --> file/path:3:2
+  |
+3 | a
+  |  ^
+4 | b
+  |"#]];
+    let renderer = Renderer::plain().anonymized_line_numbers(false);
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn annotate_eol_double_width() {
+    let snippets = Level::Error.title("").snippet(
+        Snippet::source("こん\r\nにちは\r\n世界")
+            .origin("<current file>")
+            .annotation(Level::Error.span(7..8)), // \n
+    );
+
+    let expected = str![[r#"
+error
+ --> <current file>:1:3
+  |
+1 | こん
+  |     ^
+2 | にちは
+3 | 世界
+  |
+"#]];
+
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(snippets).to_string(), expected);
+}
+
+#[test]
+fn multiline_eol_start() {
+    let source = "a\r\nb";
+    let input = Level::Error.title("").snippet(
+        Snippet::source(source)
+            .origin("file/path")
+            .line_start(3)
+            .annotation(Level::Error.span(1..4)), // \r\nb
+    );
+    let expected = str![[r#"
+error
+ --> file/path:3:2
+  |
+3 |   a
+  |  __^
+4 | | b
+  | |_^
+  |"#]];
+    let renderer = Renderer::plain().anonymized_line_numbers(false);
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn multiline_eol_start2() {
+    let source = "a\r\nb";
+    let input = Level::Error.title("").snippet(
+        Snippet::source(source)
+            .origin("file/path")
+            .line_start(3)
+            .annotation(Level::Error.span(2..4)), // \nb
+    );
+    let expected = str![[r#"
+error
+ --> file/path:3:2
+  |
+3 |   a
+  |  __^
+4 | | b
+  | |_^
+  |"#]];
+    let renderer = Renderer::plain().anonymized_line_numbers(false);
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn multiline_eol_start3() {
+    let source = "a\nb";
+    let input = Level::Error.title("").snippet(
+        Snippet::source(source)
+            .origin("file/path")
+            .line_start(3)
+            .annotation(Level::Error.span(1..3)), // \nb
+    );
+    let expected = str![[r#"
+error
+ --> file/path:3:2
+  |
+3 |   a
+  |  __^
+4 | | b
+  | |_^
+  |"#]];
+    let renderer = Renderer::plain().anonymized_line_numbers(false);
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn multiline_eol_start_double_width() {
+    let snippets = Level::Error.title("").snippet(
+        Snippet::source("こん\r\nにちは\r\n世界")
+            .origin("<current file>")
+            .annotation(Level::Error.span(7..11)), // \r\nに
+    );
+
+    let expected = str![[r#"
+error
+ --> <current file>:1:3
+  |
+1 |   こん
+  |  _____^
+2 | | にちは
+  | |__^
+3 |   世界
+  |
+"#]];
+
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(snippets).to_string(), expected);
+}
+
+#[test]
+fn multiline_eol_start_eol_end() {
+    let source = "a\nb\nc";
+    let input = Level::Error.title("").snippet(
+        Snippet::source(source)
+            .origin("file/path")
+            .line_start(3)
+            .annotation(Level::Error.span(1..4)), // \nb\n
+    );
+    let expected = str![[r#"
+error
+ --> file/path:3:2
+  |
+3 |   a
+  |  __^
+4 | | b
+  | |__^
+5 |   c
+  |
+"#]];
+    let renderer = Renderer::plain().anonymized_line_numbers(false);
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn multiline_eol_start_eol_end2() {
+    let source = "a\r\nb\r\nc";
+    let input = Level::Error.title("").snippet(
+        Snippet::source(source)
+            .origin("file/path")
+            .line_start(3)
+            .annotation(Level::Error.span(2..5)), // \nb\r
+    );
+    let expected = str![[r#"
+error
+ --> file/path:3:2
+  |
+3 |   a
+  |  __^
+4 | | b
+  | |__^
+5 |   c
+  |
+"#]];
+    let renderer = Renderer::plain().anonymized_line_numbers(false);
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn multiline_eol_start_eol_end3() {
+    let source = "a\r\nb\r\nc";
+    let input = Level::Error.title("").snippet(
+        Snippet::source(source)
+            .origin("file/path")
+            .line_start(3)
+            .annotation(Level::Error.span(2..6)), // \nb\r\n
+    );
+    let expected = str![[r#"
+error
+ --> file/path:3:2
+  |
+3 |   a
+  |  __^
+4 | | b
+  | |__^
+5 |   c
+  |
+"#]];
+    let renderer = Renderer::plain().anonymized_line_numbers(false);
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn multiline_eol_start_eof_end() {
+    let source = "a\r\nb";
+    let input = Level::Error.title("").snippet(
+        Snippet::source(source)
+            .origin("file/path")
+            .line_start(3)
+            .annotation(Level::Error.span(1..5)), // \r\nb(EOF)
+    );
+    let expected = str![[r#"
+error
+ --> file/path:3:2
+  |
+3 |   a
+  |  __^
+4 | | b
+  | |__^
+  |
+"#]];
+    let renderer = Renderer::plain().anonymized_line_numbers(false);
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn multiline_eol_start_eof_end_double_width() {
+    let source = "ん\r\nに";
+    let input = Level::Error.title("").snippet(
+        Snippet::source(source)
+            .origin("file/path")
+            .line_start(3)
+            .annotation(Level::Error.span(3..9)), // \r\nに(EOF)
+    );
+    let expected = str![[r#"
+error
+ --> file/path:3:2
+  |
+3 |   ん
+  |  ___^
+4 | | に
+  | |___^
+  |
+"#]];
+    let renderer = Renderer::plain().anonymized_line_numbers(false);
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn two_single_line_same_line() {
+    let source = r#"bar = { version = "0.1.0", optional = true }"#;
+    let input = Level::Error.title("unused optional dependency").snippet(
+        Snippet::source(source)
+            .origin("Cargo.toml")
+            .line_start(4)
+            .annotation(
+                Level::Error
+                    .span(0..3)
+                    .label("I need this to be really long so I can test overlaps"),
+            )
+            .annotation(
+                Level::Info
+                    .span(27..42)
+                    .label("This should also be long but not too long"),
+            ),
+    );
+    let expected = str![[r#"
+error: unused optional dependency
+ --> Cargo.toml:4:1
+  |
+4 | bar = { version = "0.1.0", optional = true }
+  | ^^^                        --------------- info: This should also be long but not too long
+  | |
+  | I need this to be really long so I can test overlaps
+  |
+"#]];
+    let renderer = Renderer::plain().anonymized_line_numbers(false);
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn multi_and_single() {
+    let source = r#"bar = { version = "0.1.0", optional = true }
+this is another line
+so is this
+bar = { version = "0.1.0", optional = true }
+"#;
+    let input = Level::Error.title("unused optional dependency").snippet(
+        Snippet::source(source)
+            .line_start(4)
+            .annotation(
+                Level::Error
+                    .span(41..119)
+                    .label("I need this to be really long so I can test overlaps"),
+            )
+            .annotation(
+                Level::Info
+                    .span(27..42)
+                    .label("This should also be long but not too long"),
+            ),
+    );
+    let expected = str![[r#"
+error: unused optional dependency
+  |
+4 |   bar = { version = "0.1.0", optional = true }
+  |  ____________________________--------------^
+  | |                            |
+  | |                            info: This should also be long but not too long
+5 | | this is another line
+6 | | so is this
+7 | | bar = { version = "0.1.0", optional = true }
+  | |__________________________________________^ I need this to be really long so I can test overlaps
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn two_multi_and_single() {
+    let source = r#"bar = { version = "0.1.0", optional = true }
+this is another line
+so is this
+bar = { version = "0.1.0", optional = true }
+"#;
+    let input = Level::Error.title("unused optional dependency").snippet(
+        Snippet::source(source)
+            .line_start(4)
+            .annotation(
+                Level::Error
+                    .span(41..119)
+                    .label("I need this to be really long so I can test overlaps"),
+            )
+            .annotation(
+                Level::Error
+                    .span(8..102)
+                    .label("I need this to be really long so I can test overlaps"),
+            )
+            .annotation(
+                Level::Info
+                    .span(27..42)
+                    .label("This should also be long but not too long"),
+            ),
+    );
+    let expected = str![[r#"
+error: unused optional dependency
+  |
+4 |    bar = { version = "0.1.0", optional = true }
+  |   _________^__________________--------------^
+  |  |         |                  |
+  |  |_________|                  info: This should also be long but not too long
+  | ||
+5 | || this is another line
+6 | || so is this
+7 | || bar = { version = "0.1.0", optional = true }
+  | ||_________________________^________________^ I need this to be really long so I can test overlaps
+  | |__________________________|
+  |                            I need this to be really long so I can test overlaps
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn three_multi_and_single() {
+    let source = r#"bar = { version = "0.1.0", optional = true }
+this is another line
+so is this
+bar = { version = "0.1.0", optional = true }
+this is another line
+"#;
+    let input = Level::Error.title("unused optional dependency").snippet(
+        Snippet::source(source)
+            .line_start(4)
+            .annotation(
+                Level::Error
+                    .span(41..119)
+                    .label("I need this to be really long so I can test overlaps"),
+            )
+            .annotation(
+                Level::Error
+                    .span(8..102)
+                    .label("I need this to be really long so I can test overlaps"),
+            )
+            .annotation(
+                Level::Error
+                    .span(48..126)
+                    .label("I need this to be really long so I can test overlaps"),
+            )
+            .annotation(
+                Level::Info
+                    .span(27..42)
+                    .label("This should also be long but not too long"),
+            ),
+    );
+    let expected = str![[r#"
+error: unused optional dependency
+  |
+4 |     bar = { version = "0.1.0", optional = true }
+  |   __________^__________________--------------^
+  |  |          |                  |
+  |  |__________|                  info: This should also be long but not too long
+  | ||
+5 | ||  this is another line
+  | || ____^
+6 | ||| so is this
+7 | ||| bar = { version = "0.1.0", optional = true }
+  | |||_________________________^________________^ I need this to be really long so I can test overlaps
+  | |_|_________________________|
+  |   |                         I need this to be really long so I can test overlaps
+8 |   | this is another line
+  |   |____^ I need this to be really long so I can test overlaps
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn origin_correct_start_line() {
+    let source = "aaa\nbbb\nccc\nddd\n";
+    let input = Level::Error.title("title").snippet(
+        Snippet::source(source)
+            .origin("origin.txt")
+            .fold(false)
+            .annotation(Level::Error.span(8..8 + 3).label("annotation")),
+    );
+
+    let expected = str![[r#"
+error: title
+ --> origin.txt:3:1
+  |
+1 | aaa
+2 | bbb
+3 | ccc
+  | ^^^ annotation
+4 | ddd
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+
+#[test]
+fn origin_correct_mid_line() {
+    let source = "aaa\nbbb\nccc\nddd\n";
+    let input = Level::Error.title("title").snippet(
+        Snippet::source(source)
+            .origin("origin.txt")
+            .fold(false)
+            .annotation(Level::Error.span(8 + 1..8 + 3).label("annotation")),
+    );
+
+    let expected = str![[r#"
+error: title
+ --> origin.txt:3:2
+  |
+1 | aaa
+2 | bbb
+3 | ccc
+  |  ^^ annotation
+4 | ddd
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
--- a/crates/ruff_annotate_snippets/tests/rustc_tests.rs
+++ b/crates/ruff_annotate_snippets/tests/rustc_tests.rs
@ -0,0 +1,783 @@
+//! These tests have been adapted from [Rust's parser tests][parser-tests].
+//!
+//! [parser-tests]: https://github.com/rust-lang/rust/blob/894f7a4ba6554d3797404bbf550d9919df060b97/compiler/rustc_parse/src/parser/tests.rs
+
+use ruff_annotate_snippets::{Level, Renderer, Snippet};
+
+use snapbox::{assert_data_eq, str};
+
+#[test]
+fn ends_on_col0() {
+    let source = r#"
+fn foo() {
+}
+"#;
+    let input = Level::Error.title("foo").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .origin("test.rs")
+            .fold(true)
+            .annotation(Level::Error.span(10..13).label("test")),
+    );
+
+    let expected = str![[r#"
+error: foo
+ --> test.rs:2:10
+  |
+2 |   fn foo() {
+  |  __________^
+3 | | }
+  | |_^ test
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+#[test]
+fn ends_on_col2() {
+    let source = r#"
+fn foo() {
+
+
+  }
+"#;
+    let input = Level::Error.title("foo").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .origin("test.rs")
+            .fold(true)
+            .annotation(Level::Error.span(10..17).label("test")),
+    );
+
+    let expected = str![[r#"
+error: foo
+ --> test.rs:2:10
+  |
+2 |   fn foo() {
+  |  __________^
+3 | |
+4 | |
+5 | |   }
+  | |___^ test
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+#[test]
+fn non_nested() {
+    let source = r#"
+fn foo() {
+  X0 Y0
+  X1 Y1
+  X2 Y2
+}
+"#;
+    let input = Level::Error.title("foo").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .origin("test.rs")
+            .fold(true)
+            .annotation(Level::Error.span(14..32).label("`X` is a good letter"))
+            .annotation(
+                Level::Warning
+                    .span(17..35)
+                    .label("`Y` is a good letter too"),
+            ),
+    );
+
+    let expected = str![[r#"
+error: foo
+ --> test.rs:3:3
+  |
+3 |      X0 Y0
+  |  ____^  -
+  | | ______|
+4 | ||   X1 Y1
+5 | ||   X2 Y2
+  | ||____^__- `Y` is a good letter too
+  | |_____|
+  |       `X` is a good letter
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+#[test]
+fn nested() {
+    let source = r#"
+fn foo() {
+  X0 Y0
+  Y1 X1
+}
+"#;
+    let input = Level::Error.title("foo").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .origin("test.rs")
+            .fold(true)
+            .annotation(Level::Error.span(14..27).label("`X` is a good letter"))
+            .annotation(
+                Level::Warning
+                    .span(17..24)
+                    .label("`Y` is a good letter too"),
+            ),
+    );
+
+    let expected = str![[r#"
+error: foo
+ --> test.rs:3:3
+  |
+3 |      X0 Y0
+  |  ____^  -
+  | | ______|
+4 | ||   Y1 X1
+  | ||____-__^ `X` is a good letter
+  |  |____|
+  |       `Y` is a good letter too
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+#[test]
+fn different_overlap() {
+    let source = r#"
+fn foo() {
+  X0 Y0 Z0
+  X1 Y1 Z1
+  X2 Y2 Z2
+  X3 Y3 Z3
+}
+"#;
+    let input = Level::Error.title("foo").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .origin("test.rs")
+            .fold(true)
+            .annotation(Level::Error.span(17..38).label("`X` is a good letter"))
+            .annotation(
+                Level::Warning
+                    .span(31..49)
+                    .label("`Y` is a good letter too"),
+            ),
+    );
+
+    let expected = str![[r#"
+error: foo
+ --> test.rs:3:6
+  |
+3 |      X0 Y0 Z0
+  |  _______^
+4 | |    X1 Y1 Z1
+  | | _________-
+5 | ||   X2 Y2 Z2
+  | ||____^ `X` is a good letter
+6 |  |   X3 Y3 Z3
+  |  |____- `Y` is a good letter too
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+#[test]
+fn triple_overlap() {
+    let source = r#"
+fn foo() {
+  X0 Y0 Z0
+  X1 Y1 Z1
+  X2 Y2 Z2
+}
+"#;
+    let input = Level::Error.title("foo").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .origin("test.rs")
+            .fold(true)
+            .annotation(Level::Error.span(14..38).label("`X` is a good letter"))
+            .annotation(
+                Level::Warning
+                    .span(17..41)
+                    .label("`Y` is a good letter too"),
+            )
+            .annotation(Level::Warning.span(20..44).label("`Z` label")),
+    );
+
+    let expected = str![[r#"
+error: foo
+ --> test.rs:3:3
+  |
+3 |       X0 Y0 Z0
+  |  _____^  -  -
+  | | _______|  |
+  | || _________|
+4 | |||   X1 Y1 Z1
+5 | |||   X2 Y2 Z2
+  | |||____^__-__- `Z` label
+  | ||_____|__|
+  | |______|  `Y` is a good letter too
+  |        `X` is a good letter
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+#[test]
+fn triple_exact_overlap() {
+    let source = r#"
+fn foo() {
+  X0 Y0 Z0
+  X1 Y1 Z1
+  X2 Y2 Z2
+}
+"#;
+    let input = Level::Error.title("foo").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .origin("test.rs")
+            .fold(true)
+            .annotation(Level::Error.span(14..38).label("`X` is a good letter"))
+            .annotation(
+                Level::Warning
+                    .span(14..38)
+                    .label("`Y` is a good letter too"),
+            )
+            .annotation(Level::Warning.span(14..38).label("`Z` label")),
+    );
+
+    // This should have a `^` but we currently don't support the idea of a
+    // "primary" annotation, which would solve this
+    let expected = str![[r#"
+error: foo
+ --> test.rs:3:3
+  |
+3 | /   X0 Y0 Z0
+4 | |   X1 Y1 Z1
+5 | |   X2 Y2 Z2
+  | |    -
+  | |____|
+  |      `X` is a good letter
+  |      `Y` is a good letter too
+  |      `Z` label
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+#[test]
+fn minimum_depth() {
+    let source = r#"
+fn foo() {
+  X0 Y0 Z0
+  X1 Y1 Z1
+  X2 Y2 Z2
+  X3 Y3 Z3
+}
+"#;
+    let input = Level::Error.title("foo").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .origin("test.rs")
+            .fold(true)
+            .annotation(Level::Error.span(17..27).label("`X` is a good letter"))
+            .annotation(
+                Level::Warning
+                    .span(28..44)
+                    .label("`Y` is a good letter too"),
+            )
+            .annotation(Level::Warning.span(36..52).label("`Z`")),
+    );
+
+    let expected = str![[r#"
+error: foo
+ --> test.rs:3:6
+  |
+3 |      X0 Y0 Z0
+  |  _______^
+4 | |    X1 Y1 Z1
+  | | ____^_-
+  | ||____|
+  |  |    `X` is a good letter
+5 |  |   X2 Y2 Z2
+  |  |___-______- `Y` is a good letter too
+  |   ___|
+  |  |
+6 |  |   X3 Y3 Z3
+  |  |_______- `Z`
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+#[test]
+fn non_overlapping() {
+    let source = r#"
+fn foo() {
+  X0 Y0 Z0
+  X1 Y1 Z1
+  X2 Y2 Z2
+  X3 Y3 Z3
+}
+"#;
+    let input = Level::Error.title("foo").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .origin("test.rs")
+            .fold(true)
+            .annotation(Level::Error.span(14..27).label("`X` is a good letter"))
+            .annotation(
+                Level::Warning
+                    .span(39..55)
+                    .label("`Y` is a good letter too"),
+            ),
+    );
+
+    let expected = str![[r#"
+error: foo
+ --> test.rs:3:3
+  |
+3 | /   X0 Y0 Z0
+4 | |   X1 Y1 Z1
+  | |____^ `X` is a good letter
+5 |     X2 Y2 Z2
+  |  ______-
+6 | |   X3 Y3 Z3
+  | |__________- `Y` is a good letter too
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+#[test]
+fn overlapping_start_and_end() {
+    let source = r#"
+fn foo() {
+  X0 Y0 Z0
+  X1 Y1 Z1
+  X2 Y2 Z2
+  X3 Y3 Z3
+}
+"#;
+    let input = Level::Error.title("foo").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .origin("test.rs")
+            .fold(true)
+            .annotation(Level::Error.span(17..27).label("`X` is a good letter"))
+            .annotation(
+                Level::Warning
+                    .span(31..55)
+                    .label("`Y` is a good letter too"),
+            ),
+    );
+
+    let expected = str![[r#"
+error: foo
+ --> test.rs:3:6
+  |
+3 |      X0 Y0 Z0
+  |  _______^
+4 | |    X1 Y1 Z1
+  | | ____^____-
+  | ||____|
+  |  |    `X` is a good letter
+5 |  |   X2 Y2 Z2
+6 |  |   X3 Y3 Z3
+  |  |__________- `Y` is a good letter too
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+#[test]
+fn multiple_labels_primary_without_message() {
+    let source = r#"
+fn foo() {
+  a { b { c } d }
+}
+"#;
+    let input = Level::Error.title("foo").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .origin("test.rs")
+            .fold(true)
+            .annotation(Level::Error.span(18..25).label(""))
+            .annotation(Level::Warning.span(14..27).label("`a` is a good letter"))
+            .annotation(Level::Warning.span(22..23).label("")),
+    );
+
+    let expected = str![[r#"
+error: foo
+ --> test.rs:3:7
+  |
+3 |   a { b { c } d }
+  |   ----^^^^-^^-- `a` is a good letter
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+#[test]
+fn multiple_labels_secondary_without_message() {
+    let source = r#"
+fn foo() {
+  a { b { c } d }
+}
+"#;
+    let input = Level::Error.title("foo").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .origin("test.rs")
+            .fold(true)
+            .annotation(Level::Error.span(14..27).label("`a` is a good letter"))
+            .annotation(Level::Warning.span(18..25).label("")),
+    );
+
+    let expected = str![[r#"
+error: foo
+ --> test.rs:3:3
+  |
+3 |   a { b { c } d }
+  |   ^^^^-------^^ `a` is a good letter
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+#[test]
+fn multiple_labels_primary_without_message_2() {
+    let source = r#"
+fn foo() {
+  a { b { c } d }
+}
+"#;
+    let input = Level::Error.title("foo").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .origin("test.rs")
+            .fold(true)
+            .annotation(Level::Error.span(18..25).label("`b` is a good letter"))
+            .annotation(Level::Warning.span(14..27).label(""))
+            .annotation(Level::Warning.span(22..23).label("")),
+    );
+
+    let expected = str![[r#"
+error: foo
+ --> test.rs:3:7
+  |
+3 |   a { b { c } d }
+  |   ----^^^^-^^--
+  |       |
+  |       `b` is a good letter
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+#[test]
+fn multiple_labels_secondary_without_message_2() {
+    let source = r#"
+fn foo() {
+  a { b { c } d }
+}
+"#;
+    let input = Level::Error.title("foo").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .origin("test.rs")
+            .fold(true)
+            .annotation(Level::Error.span(14..27).label(""))
+            .annotation(Level::Warning.span(18..25).label("`b` is a good letter")),
+    );
+
+    let expected = str![[r#"
+error: foo
+ --> test.rs:3:3
+  |
+3 |   a { b { c } d }
+  |   ^^^^-------^^
+  |       |
+  |       `b` is a good letter
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+#[test]
+fn multiple_labels_secondary_without_message_3() {
+    let source = r#"
+fn foo() {
+  a  bc  d
+}
+"#;
+    let input = Level::Error.title("foo").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .origin("test.rs")
+            .fold(true)
+            .annotation(Level::Error.span(14..18).label("`a` is a good letter"))
+            .annotation(Level::Warning.span(18..22).label("")),
+    );
+
+    let expected = str![[r#"
+error: foo
+ --> test.rs:3:3
+  |
+3 |   a  bc  d
+  |   ^^^^----
+  |   |
+  |   `a` is a good letter
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+#[test]
+fn multiple_labels_without_message() {
+    let source = r#"
+fn foo() {
+  a { b { c } d }
+}
+"#;
+    let input = Level::Error.title("foo").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .origin("test.rs")
+            .fold(true)
+            .annotation(Level::Error.span(14..27).label(""))
+            .annotation(Level::Warning.span(18..25).label("")),
+    );
+
+    let expected = str![[r#"
+error: foo
+ --> test.rs:3:3
+  |
+3 |   a { b { c } d }
+  |   ^^^^-------^^
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+#[test]
+fn multiple_labels_without_message_2() {
+    let source = r#"
+fn foo() {
+  a { b { c } d }
+}
+"#;
+    let input = Level::Error.title("foo").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .origin("test.rs")
+            .fold(true)
+            .annotation(Level::Error.span(18..25).label(""))
+            .annotation(Level::Warning.span(14..27).label(""))
+            .annotation(Level::Warning.span(22..23).label("")),
+    );
+
+    let expected = str![[r#"
+error: foo
+ --> test.rs:3:7
+  |
+3 |   a { b { c } d }
+  |   ----^^^^-^^--
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+#[test]
+fn multiple_labels_with_message() {
+    let source = r#"
+fn foo() {
+  a { b { c } d }
+}
+"#;
+    let input = Level::Error.title("foo").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .origin("test.rs")
+            .fold(true)
+            .annotation(Level::Error.span(14..27).label("`a` is a good letter"))
+            .annotation(Level::Warning.span(18..25).label("`b` is a good letter")),
+    );
+
+    let expected = str![[r#"
+error: foo
+ --> test.rs:3:3
+  |
+3 |   a { b { c } d }
+  |   ^^^^-------^^
+  |   |   |
+  |   |   `b` is a good letter
+  |   `a` is a good letter
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+#[test]
+fn ingle_label_with_message() {
+    let source = r#"
+fn foo() {
+  a { b { c } d }
+}
+"#;
+    let input = Level::Error.title("foo").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .origin("test.rs")
+            .fold(true)
+            .annotation(Level::Error.span(14..27).label("`a` is a good letter")),
+    );
+
+    let expected = str![[r#"
+error: foo
+ --> test.rs:3:3
+  |
+3 |   a { b { c } d }
+  |   ^^^^^^^^^^^^^ `a` is a good letter
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+#[test]
+fn single_label_without_message() {
+    let source = r#"
+fn foo() {
+  a { b { c } d }
+}
+"#;
+    let input = Level::Error.title("foo").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .origin("test.rs")
+            .fold(true)
+            .annotation(Level::Error.span(14..27).label("")),
+    );
+
+    let expected = str![[r#"
+error: foo
+ --> test.rs:3:3
+  |
+3 |   a { b { c } d }
+  |   ^^^^^^^^^^^^^
+  |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+#[test]
+fn long_snippet() {
+    let source = r#"
+fn foo() {
+  X0 Y0 Z0
+  X1 Y1 Z1
+1
+2
+3
+4
+5
+6
+7
+8
+9
+10
+  X2 Y2 Z2
+  X3 Y3 Z3
+}
+"#;
+    let input = Level::Error.title("foo").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .origin("test.rs")
+            .fold(true)
+            .annotation(Level::Error.span(17..27).label("`X` is a good letter"))
+            .annotation(
+                Level::Warning
+                    .span(31..76)
+                    .label("`Y` is a good letter too"),
+            ),
+    );
+
+    let expected = str![[r#"
+error: foo
+  --> test.rs:3:6
+   |
+ 3 |      X0 Y0 Z0
+   |  _______^
+ 4 | |    X1 Y1 Z1
+   | | ____^____-
+   | ||____|
+   |  |    `X` is a good letter
+ 5 |  | 1
+...   |
+15 |  |   X2 Y2 Z2
+16 |  |   X3 Y3 Z3
+   |  |__________- `Y` is a good letter too
+   |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}
+#[test]
+fn long_snippet_multiple_spans() {
+    let source = r#"
+fn foo() {
+  X0 Y0 Z0
+1
+2
+3
+  X1 Y1 Z1
+4
+5
+6
+  X2 Y2 Z2
+7
+8
+9
+10
+  X3 Y3 Z3
+}
+"#;
+    let input = Level::Error.title("foo").snippet(
+        Snippet::source(source)
+            .line_start(1)
+            .origin("test.rs")
+            .fold(true)
+            .annotation(Level::Error.span(17..73).label("`Y` is a good letter"))
+            .annotation(
+                Level::Warning
+                    .span(37..56)
+                    .label("`Z` is a good letter too"),
+            ),
+    );
+
+    let expected = str![[r#"
+error: foo
+  --> test.rs:3:6
+   |
+ 3 |      X0 Y0 Z0
+   |  _______^
+ 4 | |  1
+ 5 | |  2
+ 6 | |  3
+ 7 | |    X1 Y1 Z1
+   | | _________-
+ 8 | || 4
+ 9 | || 5
+10 | || 6
+11 | ||   X2 Y2 Z2
+   | ||__________- `Z` is a good letter too
+12 | |  7
+...  |
+15 | |  10
+16 | |    X3 Y3 Z3
+   | |________^ `Y` is a good letter
+   |
+"#]];
+    let renderer = Renderer::plain();
+    assert_data_eq!(renderer.render(input).to_string(), expected);
+}