[Issue 22134] Deprecate returning a void value from a function

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22134

Iain Buclaw <ibuclaw at gdcproject.org> changed:

           What    |Removed                     |Added
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                 CC|                            |ibuclaw at gdcproject.org

--- Comment #1 from Iain Buclaw <ibuclaw at gdcproject.org> ---
To be clear, this is only about void values with no side effects.  This is
already done with ExpStatement and CommaExp with the use of the `discardValue`.

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