action doesn't work on functions with arguments

[belka-ew]

This code should fail, but it doesn't:

class B
{
    void foo(string[] = null)
    {
    }
}

unittest
{
    auto mocker = new Mocker;
    auto klass = mocker.mock!B;

    mocker.expect(klass.foo).action({ assert(false); });

    mocker.replay;

    klass.foo;

    mocker.verify;
}

[belka-ew]

mocker.expect(klass.foo).action((string[] = null) { assert(false); });

works as expected.

mocker.expect(klass.foo).action(delegate void(string[] = null) { assert(false); });

works as expected.

[belka-ew]

    mocker.expect(klass.foo(null)).action((string[]) => { assert(false); });

doesn't fail.

Event if the passed callback has wrong signature, caller should be notified (with an exception according to the function documentation).