[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 #9 from github-bugzilla at puremagic.com ---
Commits pushed to master at https://github.com/dlang/dmd

https://github.com/dlang/dmd/commit/a1a87203a1f01c79a96ffbc1a45cece2fed6501e
add test for issue 18955

https://github.com/dlang/dmd/commit/00f4c42c92da7fd590a8edf8dc6c6562fe988fe4
Merge pull request #8708 from rainers/test_18955

add test for issue 18955
merged-on-behalf-of: Petar Kirov <ZombineDev at users.noreply.github.com>

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