[Issue 20649] _d_arraysetlengthT crashes when std.traits.ReturnType is used with auto function

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20649

--- Comment #2 from Basile-z <b2.temp at gmx.com> ---
sorry, the reg is from 2.088 and 2.087.1 is the last working.

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