[Issue 21807] Non-immutable data can be converted to immutable using function call in ctor

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21807

--- Comment #9 from Dlang Bot <dlang-bot at dlang.rocks> ---
@MoonlightSentinel created dlang/dmd pull request #12408 "Merge stable into
master" mentioning this issue:

- Issue 21807 - Missing deprecation when slicing static array temporary...

  ...in class methods.

  The checks for such slices relied on `va` while actually just caring
  about the current type. This was broken by [1] which clears `va` for
  class members to detect escapes of delegates.

  This also applied to the checks for struct temporaries/literals.

  [1] https://github.com/dlang/dmd/pull/8008

https://github.com/dlang/dmd/pull/12408

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