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This assignment operator was previously broken since the SFINAE always resulted in substitution failure. This caused assignments to turn into copy construction + assignment. This patch was originally committed as r279953 but was reverted due to warnings in the test-suite. This new patch corrects those warnings. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@279955 91177308-0d34-0410-b5e6-96231b3b80d8