add conversion boilerplate

1 files changed, 6 insertions, 0 deletions

diff --git a/crates/ra_hir/src/macros/mbe.rs b/crates/ra_hir/src/macros/mbe.rs
index 5c1771a15..2d7965b62 100644
--- a/crates/ra_hir/src/macros/mbe.rs
+++ b/crates/ra_hir/src/macros/mbe.rs
@@ -1,5 +1,7 @@
 use ra_syntax::SmolStr;
 
+use crate::macros::tt;
+
 struct MacroRules {
     rules: Vec<Rule>,
 }
@@ -48,3 +50,7 @@ struct Ident {
 struct Var {
     text: SmolStr,
 }
+
+fn parse(tt: tt::TokenTree) -> MacroRules {
+    MacroRules { rules: Vec::new() }
+}