[Issue 18955] extern(C++) default struct mangling is overridden when interacting with a `cppmangle = class` template

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18955

--- Comment #6 from Steven Schveighoffer <schveiguy at yahoo.com> ---
Sorry, I fixed a typo in the title of the bug report "tamplate".

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