{"ast_node_type":"import","tokens":[{"end":84,"kind":"keyword","start":0,"text":"//"}]}
                    // If it's builtin, we can reuse the type, this helps inference.
                    let result = self.check_user_unop(expr, oprnd_t, unop, expected_inner);
                    if !(oprnd_t.is_integral() || *oprnd_t.kind() == ty::Bool) {