[Issue 21780] alias this preferred over immutable conversion even if alias this is deprecated and de is on

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21780

moonlightsentinel at disroot.org changed:

           What    |Removed                     |Added
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            Summary|deprecation warning for     |alias this preferred over
                   |considered but unused alias |immutable conversion even
                   |this                        |if alias this is deprecated
                   |                            |and de is on

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