[Issue 23154] Linker error through templated __traits(compiles) in separate compilation unit

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23154

--- Comment #4 from Jan Jurzitza <d.bugs at webfreak.org> ---
nvm, actually reproduces with ldc as well, so more likely a frontend bug:

ldc2 -main -c -unittest -I. foo.d -of foo.o
ldc2 -lib -ofprotocol.a protocol.d
dmd -oftestlib foo.o protocol.a

For some reason ldc generated extra objects which I accidentally used instead,
which were the wrong symbols and didn't cause this linker error.

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