Rollup merge of #66381 - Centril:66340, r=petrochenkov

find_deprecation: deprecation attr may be ill-formed meta.

Fixes #66340.

r? @petrochenkov
cc @pnkfelix

src/test/ui/deprecation/issue-66340-deprecated-attr-non-meta-grammar.rs

@@ -0,0 +1,11 @@
+// The original problem in #66340 was that `find_deprecation_generic`
+// called `attr.meta().unwrap()` under the assumption that the attribute
+// was a well-formed `MetaItem`.
+
+fn main() {
+    foo()
+}
+
+#[deprecated(note = test)]
+//~^ ERROR expected unsuffixed literal or identifier, found `test`
+fn foo() {}

src/test/ui/deprecation/issue-66340-deprecated-attr-non-meta-grammar.stderr

@@ -0,0 +1,8 @@
+error: expected unsuffixed literal or identifier, found `test`
+  --> $DIR/issue-66340-deprecated-attr-non-meta-grammar.rs:9:21
+   |
+LL | #[deprecated(note = test)]
+   |                     ^^^^
+
+error: aborting due to previous error
+