[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 #1 from moonlightsentinel at disroot.org ---
This is actually a regression. Extending your example with appropriate
puts("Nullable") / puts("S") yields:

Up to      2.060  : Success with output: Nullable

2.061   to 2.075.1: <Doesn't compile due to overload resolution error>

2.076.1 to 2.087.1: Success with output: S
Since      2.088.1: Success with output:
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onlineapp.d(14): Deprecation: `alias get_ this` is deprecated
S
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