[Issue 20899] Qualifiers on alias parameters inconsistency between built-in types and user defined types

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20899

--- Comment #1 from John Colvin <john.loughran.colvin at gmail.com> ---
Related: https://issues.dlang.org/show_bug.cgi?id=11480

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