[Issue 23464] Pathological compilation slowdown when mixin in large switches

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23464

--- Comment #2 from Dennis <dkorpel at live.nl> ---
Created attachment 1859
  --> https://issues.dlang.org/attachment.cgi?id=1859&action=edit
Self-contained test case

I attached my reduction in expanded form in a single file.

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