[Issue 20429] extern(C++) mangling of multiple const ref params

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20429

kinke <kinke at gmx.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
                 CC|                            |kinke at gmx.net
         Resolution|INVALID                     |---

--- Comment #2 from kinke <kinke at gmx.net> ---
I can reproduce this, after fixing your pragma(mangle) (using `foo` twice). The
`bar` Itanium mangling is fine (with/without namespace), but `foo` is off -
`_ZN4blah3fooERKNS_1SES1_` (DMD frontend) vs. `_ZN4blah3fooERKNS_1SES2_` (gcc,
https://cpp.godbolt.org/z/j9sZdM). Haven't checked MSVC mangling.

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