Function expect_token

lib/parse-js.js:749–754

(type, val)

    };

    function expect_token(type, val) {
        if (is(type, val)) {
            return next();
        }
        token_error(S.token, "Unexpected token " + S.token.type + ", expected " + type);
    };

    function expect(punc) { return expect_token("punc", punc); };