[Issue 18718] ICE in dmd/traits.d:417

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18718

--- Comment #1 from Seb <greensunny12 at gmail.com> ---
A start - https://github.com/dlang/dmd/pull/8125 (<- needs more work)

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