(Ubuntu 16.04 - DMD64 D Compiler v2.071.0)
For example, when following these steps I get a failed unit test: $ cd /usr/include/dmd/phobos/std/$ rdmd -I/usr/include/dmd/phobos/std -I/usr/include/dmd/phobos/core -main -unittest -profile format.d
(Ubuntu 16.04 - DMD64 D Compiler v2.071.0)
For example, when following these steps I get a failed unit test: $ cd /usr/include/dmd/phobos/std/$ rdmd -I/usr/include/dmd/phobos/std -I/usr/include/dmd/phobos/core -main -unittest -profile format.d