Added extra test case

Author: teofr

tests/ui-toml/undocumented_unsafe_blocks/undocumented_unsafe_blocks.default.stderr

@@ -414,5 +414,17 @@ help: consider removing the safety comment
 LL |     // SAFETY: ...
    |     ^^^^^^^^^^^^^^
 
-error: aborting due to 45 previous errors
+error: statement has unnecessary safety comment
+  --> tests/ui-toml/undocumented_unsafe_blocks/undocumented_unsafe_blocks.rs:773:9
+   |
+LL |         let x = 34;
+   |         ^^^^^^^^^^^
+   |
+help: consider removing the safety comment
+  --> tests/ui-toml/undocumented_unsafe_blocks/undocumented_unsafe_blocks.rs:771:9
+   |
+LL |         // SAFETY: ...
+   |         ^^^^^^^^^^^^^^
+
+error: aborting due to 46 previous errors
 

tests/ui-toml/undocumented_unsafe_blocks/undocumented_unsafe_blocks.rs

@@ -751,7 +751,7 @@ mod issue_14555 {
     //~^ unnecessary_safety_comment
 }
 
-mod issue_todo {
+mod issue_15754 {
     #[must_use]
     // SAFETY: ...
     #[doc(hidden)]
@@ -765,6 +765,14 @@ mod issue_todo {
         unsafe {}
         //~[disabled]^ undocumented_unsafe_blocks
     }
+
+    fn bar() {
+        #[doc(hidden)]
+        // SAFETY: ...
+        #[allow(clippy::unnecessary_cast)]
+        let x = 34;
+        //~[default]^ unnecessary_safety_comment
+    }
 }
 
 fn main() {}