[Issue 23117] crash in @safe code after CTFE

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23117

--- Comment #2 from Dennis <dkorpel at live.nl> ---
Reduced some more:
```
@safe:

auto crash = foo(10);

void main()
{
    assert(crash.front == 10);
}

struct Map(alias f)
{
    int front() { return f(); }
}

auto foo(int r)
{
    return Map!(() => r)();
}
```

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