Fix use closure parsing error message

1 files changed, 16 insertions, 3 deletions

diff --git a/compiler/rustc_parse/src/parser/item.rs b/compiler/rustc_parse/src/parser/item.rs
index 961e81989d6..678376aee4f 100644
--- a/compiler/rustc_parse/src/parser/item.rs
+++ b/compiler/rustc_parse/src/parser/item.rs
@@ -209,9 +209,7 @@ impl<'a> Parser<'a> {
         let check_pub = def == &Defaultness::Final;
         let mut def_ = || mem::replace(def, Defaultness::Final);
 
-        let info = if !self.look_ahead(1, |t| [token::OrOr, token::Or].contains(&t.kind))
-            && self.eat_keyword_case(exp!(Use), case)
-        {
+        let info = if !self.is_use_closure() && self.eat_keyword_case(exp!(Use), case) {
             self.parse_use_item()?
         } else if self.check_fn_front_matter(check_pub, case) {
             // FUNCTION ITEM
@@ -1279,6 +1277,21 @@ impl<'a> Parser<'a> {
         None
     }
 
+    fn is_use_closure(&self) -> bool {
+        if self.token.is_keyword(kw::Use) {
+            // Check if this could be a closure.
+            self.look_ahead(1, |token| {
+                // Move or Async here would be an error but still we're parsing a closure
+                let dist =
+                    if token.is_keyword(kw::Move) || token.is_keyword(kw::Async) { 2 } else { 1 };
+
+                self.look_ahead(dist, |token| matches!(token.kind, token::Or | token::OrOr))
+            })
+        } else {
+            false
+        }
+    }
+
     fn is_unsafe_foreign_mod(&self) -> bool {
         self.token.is_keyword(kw::Unsafe)
             && self.is_keyword_ahead(1, &[kw::Extern])