https://issues.dlang.org/show_bug.cgi?id=24469

--- Comment #1 from Marcelo Silva Nascimento Mancini <msnmancini@hotmail.com> ---
I was able to reduce the bug:

```d
struct ExistenceChecker
{
    ///Optional.
    bool delegate() checkExistenceFn;

}
ExistenceChecker makeExistenceChecker(string gemName)
{
    return ExistenceChecker(()
    {
        return executeShell("gem list | grep "~gemName).status == 0;
    });
}

ExistenceChecker[] chks = [
    makeExistenceChecker("test")
];
```

--

https://issues.dlang.org/show_bug.cgi?id=24469

kinke <kinke@gmx.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kinke@gmx.net

--- Comment #2 from kinke <kinke@gmx.net> ---
Full example, showing the crash with DMD (LDC issues a compile error instead - 'Error: non-constant nested delegate literal expression `__lambda2`'):

```
struct ExistenceChecker
{
    bool delegate() checkExistenceFn;
}

ExistenceChecker makeExistenceChecker(string gemName)
{
    return ExistenceChecker(() => gemName == "dummy");
}

auto checker = makeExistenceChecker("test"); // => invalid non-constant
initializer

void main()
{
    assert(!checker.checkExistenceFn());
}
```

--

https://issues.dlang.org/show_bug.cgi?id=24469

kinke <kinke@gmx.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|critical                    |regression

--- Comment #3 from kinke <kinke@gmx.net> ---
Oh and this is a regression according to run.dlang.io - up to v2.078, DMD issued a 'Error: non-constant nested delegate literal expression `__lambda2`' error too; since v2.079, it allows compilation but crashes at runtime.

--