Revert "Upgrade to Rust 1.82 toolchain" (#13810)

.github/workflows/ci.yaml

@@ -193,7 +193,7 @@ jobs:
         run: rustup target add wasm32-unknown-unknown
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 18
           cache: "npm"
           cache-dependency-path: playground/package-lock.json
       - uses: jetli/wasm-pack-action@v0.4.0

.github/workflows/publish-playground.yml

@@ -29,7 +29,7 @@ jobs:
         run: rustup target add wasm32-unknown-unknown
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 18
           cache: "npm"
           cache-dependency-path: playground/package-lock.json
       - uses: jetli/wasm-pack-action@v0.4.0

.github/workflows/publish-wasm.yml

@@ -43,7 +43,7 @@ jobs:
       - run: cp LICENSE crates/ruff_wasm/pkg # wasm-pack does not put the LICENSE file in the pkg
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 18
           registry-url: "https://registry.npmjs.org"
       - name: "Publish (dry-run)"
         if: ${{ inputs.plan == '' || fromJson(inputs.plan).announcement_tag_is_implicit }}

crates/red_knot_server/src/server.rs

@@ -1,7 +1,6 @@
 //! Scheduling, I/O, and API endpoints.
 
 use std::num::NonZeroUsize;
-#[allow(deprecated)]
 use std::panic::PanicInfo;
 
 use lsp_server::Message;
@@ -120,7 +119,6 @@ impl Server {
     }
 
     pub(crate) fn run(self) -> crate::Result<()> {
-        #[allow(deprecated)]
         type PanicHook = Box<dyn Fn(&PanicInfo<'_>) + 'static + Sync + Send>;
         struct RestorePanicHook {
             hook: Option<PanicHook>,

crates/ruff_linter/src/rules/pyupgrade/rules/printf_string_formatting.rs

@@ -235,7 +235,8 @@ fn clean_params_dictionary(right: &Expr, locator: &Locator, stylist: &Stylist) -
         let mut seen: Vec<&str> = vec![];
         let mut indent = None;
         for ast::DictItem { key, value } in items {
-            if let Some(key) = key {
+            match key {
+                Some(key) => {
                     if let Expr::StringLiteral(ast::ExprStringLiteral {
                         value: key_string, ..
                     }) = key
@@ -261,11 +262,13 @@ fn clean_params_dictionary(right: &Expr, locator: &Locator, stylist: &Stylist) -
                         // If there are any non-string keys, abort.
                         return None;
                     }
-            } else {
+                }
+                None => {
                     let value_string = locator.slice(value);
                     arguments.push(format!("**{value_string}"));
                 }
             }
+        }
         // If we couldn't parse out key values, abort.
         if arguments.is_empty() {
             return None;

crates/ruff_macros/src/cache_key.rs

@@ -75,11 +75,12 @@ pub(crate) fn derive_cache_key(item: &DeriveInput) -> syn::Result<TokenStream> {
                     }
                 }
 
-                let field_attr = if let Some(ident) = &field.ident {
+                let field_attr = match &field.ident {
-                    quote!(self.#ident)
+                    Some(ident) => quote!(self.#ident),
-                } else {
+                    None => {
                         let index = syn::Index::from(i);
                         quote!(self.#index)
+                    }
                 };
 
                 fields.push(quote!(#field_attr.cache_key(key);));

crates/ruff_macros/src/map_codes.rs

@@ -143,10 +143,9 @@ pub(crate) fn map_codes(func: &ItemFn) -> syn::Result<TokenStream> {
         for (prefix, rules) in &rules_by_prefix {
             let prefix_ident = get_prefix_ident(prefix);
             let attrs = intersection_all(rules.iter().map(|(.., attrs)| attrs.as_slice()));
-            let attrs = if attrs.is_empty() {
+            let attrs = match attrs.as_slice() {
-                quote!()
+                [] => quote!(),
-            } else {
+                [..] => quote!(#(#attrs)*),
-                quote!(#(#attrs)*)
             };
             all_codes.push(quote! {
                 #attrs Self::#linter(#linter::#prefix_ident)
@@ -162,10 +161,9 @@ pub(crate) fn map_codes(func: &ItemFn) -> syn::Result<TokenStream> {
             });
             let prefix_ident = get_prefix_ident(&prefix);
             let attrs = intersection_all(rules.iter().map(|(.., attrs)| attrs.as_slice()));
-            let attrs = if attrs.is_empty() {
+            let attrs = match attrs.as_slice() {
-                quote!()
+                [] => quote!(),
-            } else {
+                [..] => quote!(#(#attrs)*),
-                quote!(#(#attrs)*)
             };
             prefix_into_iter_match_arms.extend(quote! {
                 #attrs #linter::#prefix_ident => vec![#(#rule_paths,)*].into_iter(),

crates/ruff_macros/src/rule_code_prefix.rs

@@ -90,10 +90,9 @@ fn attributes_for_prefix(
     attributes: &BTreeMap<String, &[Attribute]>,
 ) -> proc_macro2::TokenStream {
     let attrs = intersection_all(codes.iter().map(|code| attributes[code]));
-    if attrs.is_empty() {
+    match attrs.as_slice() {
-        quote!()
+        [] => quote!(),
-    } else {
+        [..] => quote!(#(#attrs)*),
-        quote!(#(#attrs)*)
     }
 }
 

crates/ruff_python_formatter/src/pattern/pattern_match_star.rs

@@ -18,10 +18,9 @@ impl FormatNodeRule<PatternMatchStar> for FormatPatternMatchStar {
 
         write!(f, [token("*"), dangling_comments(dangling)])?;
 
-        if let Some(name) = name {
+        match name {
-            write!(f, [name.format()])
+            Some(name) => write!(f, [name.format()]),
-        } else {
+            None => write!(f, [token("_")]),
-            write!(f, [token("_")])
         }
     }
 }

crates/ruff_server/src/server.rs

@@ -6,7 +6,6 @@ use lsp_types::InitializeParams;
 use lsp_types::WorkspaceFolder;
 use std::num::NonZeroUsize;
 use std::ops::Deref;
-#[allow(deprecated)]
 use std::panic::PanicInfo;
 use std::str::FromStr;
 use thiserror::Error;
@@ -126,7 +125,6 @@ impl Server {
     }
 
     pub fn run(self) -> crate::Result<()> {
-        #[allow(deprecated)]
         type PanicHook = Box<dyn Fn(&PanicInfo<'_>) + 'static + Sync + Send>;
         struct RestorePanicHook {
             hook: Option<PanicHook>,

rust-toolchain.toml

@@ -1,2 +1,2 @@
 [toolchain]
-channel = "1.82"
+channel = "1.81"