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authorEdwin Cheng <[email protected]>2021-01-08 06:00:16 +0000
committerEdwin Cheng <[email protected]>2021-01-08 06:00:16 +0000
commit74a24adc8ecc8bded9d24ccede171da188696122 (patch)
tree7c03a87334ba6be2a7adc5d311c6f0adddb09dae /crates/mbe/src/mbe_expander
parent1a29934c37cf4ffa2b269c39a25245e58d3916d5 (diff)
Fix bug when $crate in LHS in mbe
Diffstat (limited to 'crates/mbe/src/mbe_expander')
-rw-r--r--crates/mbe/src/mbe_expander/transcriber.rs9
1 files changed, 4 insertions, 5 deletions
diff --git a/crates/mbe/src/mbe_expander/transcriber.rs b/crates/mbe/src/mbe_expander/transcriber.rs
index 57f3f104d..27b2ac777 100644
--- a/crates/mbe/src/mbe_expander/transcriber.rs
+++ b/crates/mbe/src/mbe_expander/transcriber.rs
@@ -119,11 +119,10 @@ fn expand_subtree(
119} 119}
120 120
121fn expand_var(ctx: &mut ExpandCtx, v: &SmolStr, id: tt::TokenId) -> ExpandResult<Fragment> { 121fn expand_var(ctx: &mut ExpandCtx, v: &SmolStr, id: tt::TokenId) -> ExpandResult<Fragment> {
122 if v == "crate" { 122 // We already handle $crate case in mbe parser
123 // We simply produce identifier `$crate` here. And it will be resolved when lowering ast to Path. 123 debug_assert!(v != "crate");
124 let tt = tt::Leaf::from(tt::Ident { text: "$crate".into(), id }).into(); 124
125 ExpandResult::ok(Fragment::Tokens(tt)) 125 if !ctx.bindings.contains(v) {
126 } else if !ctx.bindings.contains(v) {
127 // Note that it is possible to have a `$var` inside a macro which is not bound. 126 // Note that it is possible to have a `$var` inside a macro which is not bound.
128 // For example: 127 // For example:
129 // ``` 128 // ```