parser: Do not override syntactic context for dummy spans

2018-04-22 04:10:15 +03:00
parent aa7ce896f2
commit 6a4e0b3fae
3 changed files with 55 additions and 1 deletions
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -589,7 +589,8 @@ impl<'a> Parser<'a> {
            self.token_cursor.next()
        };
        if next.sp == syntax_pos::DUMMY_SP {
-            next.sp = self.prev_span;
+            // Tweak the location for better diagnostics, but keep syntactic context intact.
+            next.sp = self.prev_span.with_ctxt(next.sp.ctxt());
        }
        next
    }