[Issue 16397] missing coverage from template instances when using separate compilation

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=16397

--- Comment #6 from github-bugzilla at puremagic.com ---
Commit pushed to dmd-cxx at https://github.com/dlang/phobos

https://github.com/dlang/phobos/commit/1f7e59980539fe0f9ba352b258e8266db6bdff01
fix test coverage

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