diff --git a/crates/red_knot_python_semantic/src/types/diagnostic.rs b/crates/red_knot_python_semantic/src/types/diagnostic.rs
index 1877bf7de4..067f3d4f76 100644
--- a/crates/red_knot_python_semantic/src/types/diagnostic.rs
+++ b/crates/red_knot_python_semantic/src/types/diagnostic.rs
@@ -17,7 +17,6 @@ use ruff_text_size::{Ranged, TextRange};
 use rustc_hash::FxHashSet;
 use std::borrow::Cow;
 use std::fmt::Formatter;
-use std::ops::Deref;
 use std::sync::Arc;
 
 /// Registers all known type check lints.
@@ -985,6 +984,10 @@ impl TypeCheckDiagnostics {
         self.used_suppressions.shrink_to_fit();
         self.diagnostics.shrink_to_fit();
     }
+
+    pub fn iter(&self) -> std::slice::Iter<'_, Arc<TypeCheckDiagnostic>> {
+        self.diagnostics.iter()
+    }
 }
 
 impl std::fmt::Debug for TypeCheckDiagnostics {
@@ -993,14 +996,6 @@ impl std::fmt::Debug for TypeCheckDiagnostics {
     }
 }
 
-impl Deref for TypeCheckDiagnostics {
-    type Target = [std::sync::Arc<TypeCheckDiagnostic>];
-
-    fn deref(&self) -> &Self::Target {
-        &self.diagnostics
-    }
-}
-
 impl IntoIterator for TypeCheckDiagnostics {
     type Item = Arc<TypeCheckDiagnostic>;
     type IntoIter = std::vec::IntoIter<std::sync::Arc<TypeCheckDiagnostic>>;