From d20eea073eff348cbc38c03c45305cf21e428f69 Mon Sep 17 00:00:00 2001
From: Edwin Cheng <edwin0cheng@gmail.com>
Date: Sat, 25 Apr 2020 17:37:34 +0800
Subject: Special case for empty comments

---
 crates/ra_mbe/src/tests.rs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'crates/ra_mbe')

diff --git a/crates/ra_mbe/src/tests.rs b/crates/ra_mbe/src/tests.rs
index 100ed41f2..364dcc3c3 100644
--- a/crates/ra_mbe/src/tests.rs
+++ b/crates/ra_mbe/src/tests.rs
@@ -1849,3 +1849,16 @@ fn test_expand_bad_literal() {
     )
     .assert_expand_err(r#"foo!(&k");"#, &ExpandError::BindingError("".into()));
 }
+
+#[test]
+fn test_empty_comments() {
+    parse_macro(
+        r#"
+        macro_rules! one_arg_macro { ($fmt:expr) => (); }        
+    "#,
+    )
+    .assert_expand_err(
+        r#"one_arg_macro!(/**/)"#,
+        &ExpandError::BindingError("expected Expr".into()),
+    );
+}
-- 
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