Fix duplicated type annotation suggestion

Before, there was more or less duplicated suggestions to add type hints.
Fix by clearing more generic suggestions when a more specific suggestion
is possible.

This fixes #93506 .

1 files changed, 8 insertions, 0 deletions

diff --git a/compiler/rustc_errors/src/diagnostic.rs b/compiler/rustc_errors/src/diagnostic.rs
index 9429ad1a897..da321c45875 100644
--- a/compiler/rustc_errors/src/diagnostic.rs
+++ b/compiler/rustc_errors/src/diagnostic.rs
@@ -614,6 +614,14 @@ impl Diagnostic {
         self
     }
 
+    /// Clear any existing suggestions.
+    pub fn clear_suggestions(&mut self) -> &mut Self {
+        if let Ok(suggestions) = &mut self.suggestions {
+            suggestions.clear();
+        }
+        self
+    }
+
     /// Helper for pushing to `self.suggestions`, if available (not disable).
     fn push_suggestion(&mut self, suggestion: CodeSuggestion) {
         if let Ok(suggestions) = &mut self.suggestions {