[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

kinke <kinke at gmx.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kinke at gmx.net

--- Comment #11 from kinke <kinke at gmx.net> ---
Possibly related:

```
extern (C++, std)
struct pair(T1, T2) {}

extern (C++)
void func_20413(pair!(int, float), pair!(float, int));
```

actual:   _Z10func_20413St4pairIifEStS_IfiE
expected: _Z10func_20413St4pairIifES_IfiE

A C++ string namespace `extern (C++, "std") struct pair(T1, T2) {}` works as
expected (testcase from https://issues.dlang.org/show_bug.cgi?id=20413).

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