Merge #1242

1242: Fix missing empty vars in $repeat while macro expansion r=matklad a=edwin0cheng

This PR fixes a bug we forget to collect an empty vars in $repeat patterns.

Related issues: #1240 

Co-authored-by: Edwin Cheng <[email protected]>

1 files changed, 3 insertions, 0 deletions

diff --git a/crates/ra_mbe/src/mbe_expander.rs b/crates/ra_mbe/src/mbe_expander.rs
index 4b007647c..3a4dbb5f5 100644
--- a/crates/ra_mbe/src/mbe_expander.rs
+++ b/crates/ra_mbe/src/mbe_expander.rs
@@ -177,6 +177,9 @@ fn collect_vars(subtree: &crate::Subtree) -> Vec<SmolStr> {
             crate::TokenTree::Subtree(subtree) => {
                 res.extend(collect_vars(subtree));
             }
+            crate::TokenTree::Repeat(crate::Repeat { subtree, .. }) => {
+                res.extend(collect_vars(subtree));
+            }
             _ => {}
         }
     }