[Issue 20033] alias this does not support `deprecated` attribute

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20033

--- Comment #4 from Dlang Bot <dlang-bot at dlang.rocks> ---
vibe-d/vibe.d pull request #2334 "Collection of code cleanup" was merged into
master:

- d909845cf5e4131671090bad5f53eacfdfc17978 by Geod24:
  Do not use deprecated alias this in Vibe.d code

  The `alias byKeyValue this` has been deprecated since v0.8.1 (released
2017-08-30).
  However, thanks to issue 20033 the deprecation never triggered for user code.
  This fixes Vibe.d code not to use the deprecated code.
  However, removing the symbol is likely to break user code as the compiler
does
  not show any deprecation message at the moment.

https://github.com/vibe-d/vibe.d/pull/2334

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