[Issue 13595] Extend std.algorithm.groupBy to support non-equivalence relations

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13595

--- Comment #8 from hsteoh at quickfur.ath.cx ---
It looks like a compiler bug, in both cases the type returned by schwartzSort
is exactly the same, but somehow the compiler treats it differently.

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