Add separate 'async_closure' feature gate.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/libsyntax/parse/mod.rs b/src/libsyntax/parse/mod.rs
index e19eab371f4..4056905d5dd 100644
--- a/src/libsyntax/parse/mod.rs
+++ b/src/libsyntax/parse/mod.rs
@@ -57,6 +57,8 @@ pub struct ParseSess {
     pub param_attr_spans: Lock<Vec<Span>>,
     // Places where `let` exprs were used and should be feature gated according to `let_chains`.
     pub let_chains_spans: Lock<Vec<Span>>,
+    // Places where `async || ..` exprs were used and should be feature gated.
+    pub async_closure_spans: Lock<Vec<Span>>,
 }
 
 impl ParseSess {
@@ -84,6 +86,7 @@ impl ParseSess {
             ambiguous_block_expr_parse: Lock::new(FxHashMap::default()),
             param_attr_spans: Lock::new(Vec::new()),
             let_chains_spans: Lock::new(Vec::new()),
+            async_closure_spans: Lock::new(Vec::new()),
         }
     }