Auto merge of rust-lang#12199 - jonas-schievink:no-invalid-assoc-ty-completions, r=jonas-schievink

fix: Don't show assoc. type binding completions when invalid

Fixes rust-lang/rust-analyzer#12165

Author: bors

crates/ide-completion/src/completions/type.rs

@@ -165,15 +165,17 @@ pub(crate) fn complete_type_path(acc: &mut Completions, ctx: &CompletionContext)
             if let Some(ImmediateLocation::GenericArgList(arg_list)) = &ctx.completion_location {
                 if let Some(path_seg) = arg_list.syntax().parent().and_then(ast::PathSegment::cast)
                 {
-                    if let Some(hir::PathResolution::Def(hir::ModuleDef::Trait(trait_))) =
-                        ctx.sema.resolve_path(&path_seg.parent_path())
-                    {
-                        trait_.items_with_supertraits(ctx.sema.db).into_iter().for_each(|it| {
-                            if let hir::AssocItem::TypeAlias(alias) = it {
-                                cov_mark::hit!(complete_assoc_type_in_generics_list);
-                                acc.add_type_alias_with_eq(ctx, alias)
-                            }
-                        });
+                    if path_seg.syntax().ancestors().find_map(ast::TypeBound::cast).is_some() {
+                        if let Some(hir::PathResolution::Def(hir::ModuleDef::Trait(trait_))) =
+                            ctx.sema.resolve_path(&path_seg.parent_path())
+                        {
+                            trait_.items_with_supertraits(ctx.sema.db).into_iter().for_each(|it| {
+                                if let hir::AssocItem::TypeAlias(alias) = it {
+                                    cov_mark::hit!(complete_assoc_type_in_generics_list);
+                                    acc.add_type_alias_with_eq(ctx, alias)
+                                }
+                            });
+                        }
                     }
                 }
             }

crates/ide-completion/src/tests/type_pos.rs

@@ -393,6 +393,38 @@ fn foo<'lt, T: Trait2<self::$0>, const CONST_PARAM: usize>(_: T) {}
     );
 }
 
+#[test]
+fn no_assoc_completion_outside_type_bounds() {
+    check(
+        r#"
+struct S;
+trait Tr<T> {
+    type Ty;
+}
+
+impl Tr<$0
+    "#,
+        expect![[r#"
+            ct CONST
+            en Enum
+            ma makro!(…) macro_rules! makro
+            md module
+            sp Self
+            st Record
+            st S
+            st Tuple
+            st Unit
+            tt Tr
+            tt Trait
+            un Union
+            bt u32
+            kw crate::
+            kw self::
+            kw super::
+        "#]],
+    );
+}
+
 #[test]
 fn enum_qualified() {
     check(