[Issue 21210] std.traits : isAssignable false positive on disabled copy struct

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21210

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

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--- Comment #1 from Dlang Bot <dlang-bot at dlang.rocks> ---
@Geod24 created dlang/phobos pull request #7612 "Fix 21210:  std.traits :
isAssignable false positive on disabled copy struct" fixing this issue:

- Fix 21210:  std.traits : isAssignable false positive on disabled copy struct

  `isAssignable` would previously return `true` for non-copyable types,
  even though code that tried to use an lvalue would not compile.
  This behavior was originally found when implementing `-preview=in`.

  With the new -preview=in check, the const-folding seemed to be a bit
  too aggressive when an rvalue is passed, meaning that the check might
  fail (probably due to the code that initialize the temporary).

https://github.com/dlang/phobos/pull/7612

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