Struct with opDispatch doesn't dispatch. Is this a bug?

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I wasn't 100% sure the following is a bug, so I figured I'd ask.

struct Fail
{
        void opDispatch(string s)()
        {
                static assert(false, "Tried to call a method on Fail");
        }
}

void main()
{
        auto fail = Fail();
        fail.s(); //Error: no property 's' for type 'Fail'
}