[Issue 23101] [std.sumtype] canMatch does not account ref

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https://issues.dlang.org/show_bug.cgi?id=23101

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

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--- Comment #2 from Dlang Bot <dlang-bot at dlang.rocks> ---
@iK4tsu created dlang/phobos pull request #8457 "Issue 23101 - [std.sumtype]
canMatch does not account ref " fixing this issue:

- fix(sumtype): template canMatch does not account for ref when matching

  The template `canMatch` does not account for `ref`.
  The template `valueTypes` stores all types of the member values and uses
SumTypes's `get` function, which returns a `ref`.
  However, ref does not persist and the type is not sent to `canMatch` as a
`ref`.
  Because of this, when matching, `canMatch` will fail as it will test for a
copy, and returning a reference of that value results in escaping it.

  Fix Issue 23101

  Signed-off-by: João Lourenço <jlourenco5691 at gmail.com>

https://github.com/dlang/phobos/pull/8457

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