[Issue 21231] Unreachable warning for empty struct in VariantN with preview=fieldwise
d-bugmail at puremagic.com
d-bugmail at puremagic.com
Tue Sep 8 19:01:06 UTC 2020
https://issues.dlang.org/show_bug.cgi?id=21231
Dlang Bot <dlang-bot at dlang.rocks> changed:
What |Removed |Added
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Keywords| |pull
--- Comment #1 from Dlang Bot <dlang-bot at dlang.rocks> ---
@MoonlightSentinel created dlang/phobos pull request #7622 "Enable
preview=fieldwise & fix blocking bug in VariantN" fixing this issue:
- Fix 21231 - Unreachable warning for empty struct in VariantN...
... with preview=fieldwise.
Equality checks will never fail for instances of empty structs, hence
don't generate code checking `<` and `>` for them.
This was exposed by `-preview=fieldwise` which (as a side effect)
enables dmd to const-fold the aformentioned equality test in the
frontend.
https://github.com/dlang/phobos/pull/7622
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