[Issue 18653] [REG2.080] ICE in statement.d 'global.gaggedErrors || global.errors'

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18653

--- Comment #1 from Seb <greensunny12 at gmail.com> ---
Reduced it further:

---
string demangle(string a)
{
    return a;
}

void main()
{
    import std.algorithm;
    [""].map!(l => l.chunkBy!(a => a == '_').map!demangle.joiner);
}
---

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