Merge #7060

7060: Fix mbe fail to pass expr with attr r=edwin0cheng a=edwin0cheng

bors r+

Fixes #5896

Co-authored-by: Edwin Cheng <edwin0cheng@gmail.com>

crates/mbe/src/tests.rs

@@ -760,6 +760,18 @@ fn test_last_expr() {
     );
 }
 
+#[test]
+fn test_expr_with_attr() {
+    parse_macro(
+        r#"
+macro_rules! m {
+    ($a:expr) => {0}
+}
+"#,
+    )
+    .assert_expand_items("m!(#[allow(a)]())", "0");
+}
+
 #[test]
 fn test_ty() {
     parse_macro(