implement SnapshotParser struct

2022-03-09 23:13:04 +09:00
parent 192acb4b98
commit 3ded25204b
2 changed files with 33 additions and 6 deletions
--- a/compiler/rustc_parse/src/parser/path.rs
+++ b/compiler/rustc_parse/src/parser/path.rs
@@ -630,9 +630,9 @@ impl<'a> Parser<'a> {
                Ok(ty) => GenericArg::Type(ty),
                Err(err) => {
                    if is_const_fn {
-                        if let Ok(expr) = snapshot.parse_expr_res(Restrictions::CONST_EXPR, None) {
-                            snapshot.unclosed_delims.extend(self.unclosed_delims.clone());
-                            *self = snapshot;
+                        if let Ok(expr) = (*snapshot).parse_expr_res(Restrictions::CONST_EXPR, None)
+                        {
+                            self.restore(snapshot);
                            return Ok(Some(self.dummy_const_arg_needs_braces(err, expr.span)));
                        }
                    }