std.traits: Adapt unittest to pass with `-preview=in`#7609

Merged

thewilsonator merged 2 commits intodlang:masterfrom Geod24:std-traits-in-ref

Aug 29, 2020

Commits on Aug 28, 2020

std.traits: Use delegates within some __traits(compiles) check to avoid constfold
Geod24
committed
std.traits: Adapt unittest to pass with -preview=in
Geod24
committed