From 408b8bcc4adb9c492cc3cc9da42ca9220aaed4ca Mon Sep 17 00:00:00 2001
From: A4-Tacks <wdsjxhno1001@163.com>
Date: Wed, 17 Sep 2025 14:59:02 +0800
Subject: [PATCH] Fix complete type in nested pattern

Example
---
```rust
struct Foo { num: u32 }
struct Bar(Foo);
fn foo(Bar($0)) {}
```

**Before this PR**:

```rust
struct Foo { num: u32 }
struct Bar(Foo);
fn foo(Bar(Foo { num$1 }: Foo$0)) {}
```

**After this PR**:

```rust
struct Foo { num: u32 }
struct Bar(Foo);
fn foo(Bar(Foo { num$1 }$0)) {}
```
---
 crates/ide-completion/src/render/pattern.rs |  1 +
 crates/ide-completion/src/tests/pattern.rs  | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/crates/ide-completion/src/render/pattern.rs b/crates/ide-completion/src/render/pattern.rs
index 60ec112823..312d3bd426 100644
--- a/crates/ide-completion/src/render/pattern.rs
+++ b/crates/ide-completion/src/render/pattern.rs
@@ -163,6 +163,7 @@ fn render_pat(
         PatternContext {
             param_ctx: Some(ParamContext { kind: ParamKind::Function(_), .. }),
             has_type_ascription: false,
+            parent_pat: None,
             ..
         }
     );
diff --git a/crates/ide-completion/src/tests/pattern.rs b/crates/ide-completion/src/tests/pattern.rs
index 9ec27252fd..6eb0b818d6 100644
--- a/crates/ide-completion/src/tests/pattern.rs
+++ b/crates/ide-completion/src/tests/pattern.rs
@@ -398,6 +398,25 @@ fn foo($0) {}
     )
 }
 
+#[test]
+fn completes_in_fn_param_in_nested_pattern() {
+    check(
+        r#"
+struct Foo { num: u32 }
+struct Bar(Foo);
+fn foo(Bar($0)) {}
+"#,
+        expect![[r#"
+            st Bar
+            st Foo
+            bn Bar(…)        Bar($1)$0
+            bn Foo {…} Foo { num$1 }$0
+            kw mut
+            kw ref
+        "#]],
+    )
+}
+
 #[test]
 fn completes_in_closure_param() {
     check(