Hristo Hristov 60bf38180b [libc++] Applied [[nodiscard]] to <fstream>, <sstream>, <strstream>, <synchstream> (#173842) ...

`[[nodiscard]]` should be applied to functions where discarding the
return value is most likely a correctness issue.

- https://libcxx.llvm.org/CodingGuidelines.html
- https://wg21.link/input.output

Towards #172124

2026-01-04 08:52:19 +02:00

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