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b1c8921c97
This is something of an edge case, but when the $HOME environment variable is not set, we can still look in the password database to get the current user's home directory. Added a test for this by getting the value of $HOME, then unsetting it, then calling home_directory() and verifying that it succeeds and that the value is the same as what we originally read from the environment. llvm-svn: 298513
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