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Constructing a std::locale object from an empty string selects the language from the current environment variables. If the environment variables name a locale that doesn't exist, or isn't installed, then the construction of facets using that locale may throw. This patch removes tests that use 'std::locale l("")'. The optimal solution would be to manually set the environment variables in the test. Unfortunately there is no portable way to do this. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@275772 91177308-0d34-0410-b5e6-96231b3b80d8