{"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"//"}]}
                // FIXME(unsafe_binders): coerce here if needed?
                let hint_ty = ascribed_ty.unwrap_or_else(|| self.next_ty_var(inner_expr.span));
                let binder_ty = self.check_expr_has_type_or_error(inner_expr, hint_ty, |_| {});