[libcxx-commits] [libcxx] [libc++][ios] Applied `[[nodiscard]]` (PR #173520)

[A. Jiang via libcxx-commits]

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frederick-vs-ja wrote:

OK. I'll mark them `[[__nodiscard__]]`, except for the protected `rdbuf` which doesn't seem intentionally exposed to users.

https://github.com/llvm/llvm-project/pull/173520