add test case for #89566

Author: chenyukang

tests/ui/proc-macro/issue-89566-suggest-fix-invalid-top-level-macro-attr.fixed

@@ -0,0 +1,6 @@
+// run-rustfix
+
+#[derive(Debug)] //~ ERROR `derive` attribute cannot be used at crate level
+struct Test {}
+
+fn main() {}

tests/ui/proc-macro/issue-89566-suggest-fix-invalid-top-level-macro-attr.rs

@@ -0,0 +1,6 @@
+// run-rustfix
+
+#![derive(Debug)] //~ ERROR `derive` attribute cannot be used at crate level
+struct Test {}
+
+fn main() {}

tests/ui/proc-macro/issue-89566-suggest-fix-invalid-top-level-macro-attr.stderr

@@ -0,0 +1,14 @@
+error: `derive` attribute cannot be used at crate level
+  --> $DIR/issue-89566-suggest-fix-invalid-top-level-macro-attr.rs:3:1
+   |
+LL | #![derive(Debug)]
+   | ^^^^^^^^^^^^^^^^^
+   |
+help: perhaps you meant to use an outer attribute
+   |
+LL - #![derive(Debug)]
+LL + #[derive(Debug)]
+   |
+
+error: aborting due to 1 previous error
+