struct Foo {

    alias returnOne this;

    uint returnOne() {
        return 1;
    }
}

void main() {
    Foo[string] AA;
    AA["bar"] = Foo.init;
}


Errors:

test.d(12): Error: function test.Foo.returnOne () is not callable using argument types (Foo)
test.d(12): Error: expected 0 arguments, not 1 for non-variadic function type uint()