[Issue 16479] Missing substitution while mangling C++ template parameter for functions

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=16479

--- Comment #12 from Mathias LANG <pro.mathias.lang at gmail.com> ---
I really wish we could deprecate 'extern(C++, ident)' and just use 'extern(C++,
"string
")' as supporting the two is an absolute mess, but Walter is against it:
https://github.com/dlang/dmd/pull/10031

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