[Issue 18275] dmd deletes source file fun.cpp with `dmd fun.cpp.o main.d`

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18275

--- Comment #1 from anonymous4 <dfj1esp02 at sneakemail.com> ---
What `clang++ fun.cpp.o` does?

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