[Issue 18954] extern(C++) ICE when `cppmangle` is used

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18954

Manu <turkeyman at gmail.com> changed:

           What    |Removed                     |Added
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           Keywords|                            |C++, industry

--- Comment #1 from Manu <turkeyman at gmail.com> ---
I don't understand the intent of the code that asserts.
Walter might want to have a look, since he probably understands what the logic
is intended to do?

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