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40e9380144
Summary: The operators simply print the underlying value or "None". The trickier part of this patch is making sure the streaming operators work even in unit tests (which was my primary motivation, though I can also see them being useful elsewhere). Since the stream operator was a template, implicit conversions did not kick in, and our gtest glue code was explicitly introducing an implicit conversion to make sure other implicit conversions do not kick in :P. I resolve that by specializing llvm_gtest::StreamSwitch for llvm:Optional<T>. Reviewers: sammccall, dblaikie Reviewed By: sammccall Subscribers: mgorny, dexonsmith, kristina, llvm-commits Differential Revision: https://reviews.llvm.org/D56795 llvm-svn: 351548
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