[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

--- Comment #2 from FeepingCreature <default_357-line at yahoo.de> ---
That's not really a "regression" - well, it is a regression, but it's an
expected regression, because Nullable's alias get this is in the process of
being deprecated and has been removed in master. A deprecation is functionally
equivalent to a regression, that's why there was a year of warning messages.

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