[libcxx-commits] [libcxx] [libc++] Eliminate extra allocations from `std::move(oss).str()` (PR #67294)

[Louis Dionne via libcxx-commits]

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ldionne wrote:

Per https://github.com/llvm/llvm-project/issues/64644#issuecomment-1748957379, it looks like this is in fact necessary for conformance.

https://github.com/llvm/llvm-project/pull/67294