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Jon Ross-Perkins
53af8f04b2
With the toolchain splitting namespaces, ostream.h's `operator<<` templates aren't reliably found with name lookup, likely due to the loss of associated namespaces (zygoloid commented on this at https://github.com/carbon-language/carbon-lang/pull/3161#discussion_r1307941999). This is especially a barrier to moving the lex files into `Carbon::Lex`; versus other parts of the toolchain, they contain more printable types which are used cross-namespace, including `Carbon::Testing`. As a consequence, I'm looking at migrating ostream.h to a more reliable approach that doesn't rely as much on everything being in the `Carbon` namespace.