Auto merge of rust-lang#12596 - Veykril:completions, r=Veykril

fix: Don't trigger pattern completions when typing a wildcard pattern

Fixes rust-lang/rust-analyzer#12592

Author: bors

crates/ide-completion/src/completions.rs

@@ -489,7 +489,11 @@ pub(super) fn complete_name(
         NameKind::Function => {
             item_list::trait_impl::complete_trait_impl_fn(acc, ctx, name);
         }
-        NameKind::IdentPat(pattern_ctx) => complete_patterns(acc, ctx, pattern_ctx),
+        NameKind::IdentPat(pattern_ctx) => {
+            if ctx.token.kind() != syntax::T![_] {
+                complete_patterns(acc, ctx, pattern_ctx)
+            }
+        }
         NameKind::Module(mod_under_caret) => {
             mod_::complete_mod(acc, ctx, mod_under_caret);
         }

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

@@ -13,6 +13,18 @@ fn check(ra_fixture: &str, expect: Expect) {
     expect.assert_eq(&actual)
 }
 
+#[test]
+fn wildcard() {
+    check(
+        r#"
+fn quux() {
+    let _$0
+}
+"#,
+        expect![""],
+    );
+}
+
 #[test]
 fn ident_rebind_pat() {
     check_empty(