Make bare underscore token an Ident rather than Punct in proc-macro

1 files changed, 6 insertions, 0 deletions

diff --git a/crates/mbe/src/tests/expand.rs b/crates/mbe/src/tests/expand.rs
index 9dd8ff75b..2cce62781 100644
--- a/crates/mbe/src/tests/expand.rs
+++ b/crates/mbe/src/tests/expand.rs
@@ -1080,6 +1080,12 @@ macro_rules! q {
 }
 
 #[test]
+fn test_underscore_lifetime() {
+    parse_macro(r#"macro_rules! q { ($a:lifetime) => {0}; }"#)
+        .assert_expand_items(r#"q!['_]"#, r#"0"#);
+}
+
+#[test]
 fn test_vertical_bar_with_pat() {
     parse_macro(
         r#"