[Issue 21912] Invalid stack closure when calling delegate inside lambda

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21912

--- Comment #3 from moonlightsentinel at disroot.org ---
Even smaller:

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DG foo(DG)(DG dg) {
    return dg;
}

auto bla(int i) {
    return foo(() => i);
}

void main() {
    assert(bla(5)() == 5);
}
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