EricWF added inline comments. ================ Comment at: test/std/language.support/support.types/byteops/xor.assign.pass.cpp:13 + +// XFAIL: c++98, c++03, c++11, c++14 + ---------------- Nit. These should be `// UNSUPPORTED`. `XFAIL` is for bugs we need to fix. https://reviews.llvm.org/D31022