function assert(b) {
    if (!b)
        throw new Error("Bad");
}

{
    let error;
    try {
        let foo = {};
        foo.bar("/abc\)*/");
    } catch(e) {
        error = e;
    }
    assert(error);
    assert(error.message ===  "undefined is not a function (near '...foo.bar(\"/abc\\)*/\")...')");
}

{
    let error;
    try {
        let blah = {};
        let x, y;
        blah("(((");
    } catch(e) {
        error = e;
    }

    // This is less than ideal, but let's be aware if we ever fix it.
    assert(error.message === "blah(\"(( is not a function. (In 'blah(\"(((\")', 'blah(\"((' is an instance of Object)");
}