diff --git a/crates/ide-diagnostics/src/handlers/incorrect_case.rs b/crates/ide-diagnostics/src/handlers/incorrect_case.rs
index 5e2541795ca1c..db28928a24ea2 100644
--- a/crates/ide-diagnostics/src/handlers/incorrect_case.rs
+++ b/crates/ide-diagnostics/src/handlers/incorrect_case.rs
@@ -512,7 +512,7 @@ impl BAD_TRAIT for () {
     fn BadFunction() {}
 }
     "#,
-            std::iter::once("unused_variables".to_owned()),
+            &["unused_variables"],
         );
     }
 
diff --git a/crates/ide-diagnostics/src/handlers/mutability_errors.rs b/crates/ide-diagnostics/src/handlers/mutability_errors.rs
index 3c71f84dc4852..91f1058d65bbc 100644
--- a/crates/ide-diagnostics/src/handlers/mutability_errors.rs
+++ b/crates/ide-diagnostics/src/handlers/mutability_errors.rs
@@ -448,7 +448,7 @@ fn main(b: bool) {
     &mut x;
 }
 "#,
-            std::iter::once("remove-unnecessary-else".to_owned()),
+            &["remove-unnecessary-else"],
         );
         check_diagnostics_with_disabled(
             r#"
@@ -463,7 +463,7 @@ fn main(b: bool) {
     &mut x;
 }
 "#,
-            std::iter::once("remove-unnecessary-else".to_owned()),
+            &["remove-unnecessary-else"],
         );
     }
 
diff --git a/crates/ide-diagnostics/src/handlers/remove_trailing_return.rs b/crates/ide-diagnostics/src/handlers/remove_trailing_return.rs
index b7667dc318f0c..7a040e46e3386 100644
--- a/crates/ide-diagnostics/src/handlers/remove_trailing_return.rs
+++ b/crates/ide-diagnostics/src/handlers/remove_trailing_return.rs
@@ -140,7 +140,7 @@ fn foo(x: usize) -> u8 {
     } //^^^^^^^^^ 💡 weak: replace return <expr>; with <expr>
 }
 "#,
-            std::iter::once("remove-unnecessary-else".to_owned()),
+            &["remove-unnecessary-else"],
         );
     }
 
diff --git a/crates/ide-diagnostics/src/handlers/remove_unnecessary_else.rs b/crates/ide-diagnostics/src/handlers/remove_unnecessary_else.rs
index 9c63d79d91033..8310af0f524c8 100644
--- a/crates/ide-diagnostics/src/handlers/remove_unnecessary_else.rs
+++ b/crates/ide-diagnostics/src/handlers/remove_unnecessary_else.rs
@@ -97,13 +97,9 @@ fn fixes(ctx: &DiagnosticsContext<'_>, d: &RemoveUnnecessaryElse) -> Option<Vec<
 mod tests {
     use crate::tests::{check_diagnostics, check_diagnostics_with_disabled, check_fix};
 
-    fn check_diagnostics_with_needless_return_disabled(ra_fixture: &str) {
-        check_diagnostics_with_disabled(ra_fixture, std::iter::once("needless_return".to_owned()));
-    }
-
     #[test]
     fn remove_unnecessary_else_for_return() {
-        check_diagnostics_with_needless_return_disabled(
+        check_diagnostics_with_disabled(
             r#"
 fn test() {
     if foo {
@@ -114,6 +110,7 @@ fn test() {
     }
 }
 "#,
+            &["needless_return"],
         );
         check_fix(
             r#"
@@ -138,7 +135,7 @@ fn test() {
 
     #[test]
     fn remove_unnecessary_else_for_return2() {
-        check_diagnostics_with_needless_return_disabled(
+        check_diagnostics_with_disabled(
             r#"
 fn test() {
     if foo {
@@ -151,6 +148,7 @@ fn test() {
     }
 }
 "#,
+            &["needless_return"],
         );
         check_fix(
             r#"
@@ -216,7 +214,7 @@ fn test(a: bool) -> i32 {
 
     #[test]
     fn remove_unnecessary_else_for_return_in_child_if_expr() {
-        check_diagnostics_with_needless_return_disabled(
+        check_diagnostics_with_disabled(
             r#"
 fn test() {
     if foo {
@@ -229,6 +227,7 @@ fn test() {
     }
 }
 "#,
+            &["needless_return"],
         );
         check_fix(
             r#"
@@ -453,7 +452,7 @@ fn test() {
 
     #[test]
     fn no_diagnostic_if_no_divergence_in_else_branch() {
-        check_diagnostics_with_needless_return_disabled(
+        check_diagnostics_with_disabled(
             r#"
 fn test() {
     if foo {
@@ -463,6 +462,7 @@ fn test() {
     }
 }
 "#,
+            &["needless_return"],
         );
     }
 
diff --git a/crates/ide-diagnostics/src/handlers/type_mismatch.rs b/crates/ide-diagnostics/src/handlers/type_mismatch.rs
index 8c97281b78328..4c255322280fc 100644
--- a/crates/ide-diagnostics/src/handlers/type_mismatch.rs
+++ b/crates/ide-diagnostics/src/handlers/type_mismatch.rs
@@ -730,7 +730,7 @@ fn f() -> i32 {
 }
 fn g() { return; }
 "#,
-            std::iter::once("needless_return".to_owned()),
+            &["needless_return"],
         );
     }
 
diff --git a/crates/ide-diagnostics/src/tests.rs b/crates/ide-diagnostics/src/tests.rs
index 4e4a851f67e0a..9e134620ee3f1 100644
--- a/crates/ide-diagnostics/src/tests.rs
+++ b/crates/ide-diagnostics/src/tests.rs
@@ -198,12 +198,9 @@ pub(crate) fn check_diagnostics(ra_fixture: &str) {
 }
 
 #[track_caller]
-pub(crate) fn check_diagnostics_with_disabled(
-    ra_fixture: &str,
-    disabled: impl Iterator<Item = String>,
-) {
+pub(crate) fn check_diagnostics_with_disabled(ra_fixture: &str, disabled: &[&str]) {
     let mut config = DiagnosticsConfig::test_sample();
-    config.disabled.extend(disabled);
+    config.disabled.extend(disabled.into_iter().map(|&s| s.to_owned()));
     check_diagnostics_with_config(config, ra_fixture)
 }