[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


Dlang Bot <dlang-bot at dlang.rocks> changed:

           What    |Removed                     |Added
           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



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