[Issue 13294] [IFTI] IFTI fails or works incorrectly for function with const and mutable `ref` parameters of most types

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13294

--- Comment #4 from Vladimir Panteleev <thecybershadow at gmail.com> ---
Introduced in https://github.com/D-Programming-Language/dmd/pull/3801

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