[Issue 18606] [REG2.072] "cannot append type const(T) to type T[]" in .dup

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18606

--- Comment #1 from Walter Bright <bugzilla at digitalmars.com> ---
(In reply to Vladimir Panteleev from comment #0)
> Introduced in https://github.com/dlang/dmd/pull/5500

This is why I don't like 700 line PRs spread across 18 files :-(

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