make sure the lint will create an error for the test

sassman · workingjubilee · sassman · commit 1b1f34465315 · 2024-10-14T00:34:31.000+02:00
Co-authored-by: Jubilee &lt;workingjubilee@gmail.com&gt;
diff --git a/tests/ui/attributes/mixed_export_name_and_no_mangle.rs b/tests/ui/attributes/mixed_export_name_and_no_mangle.rs
@@ -1,3 +1,4 @@
+#![deny(mixed_export_name_and_no_mangle)]
 // issue: rust-lang/rust#47446
 
 #[no_mangle]

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,4 @@`
	`1`	`+#![deny(mixed_export_name_and_no_mangle)]`
`1`	`2`	`// issue: rust-lang/rust#47446`
`2`	`3`
`3`	`4`	`#[no_mangle]`