Add [[nodiscard]] to tl::expected #165
Merged
+13
−12
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Microsoft STL added [[nodiscard]] on 2024-12-13; see microsoft/STL#5174
martinmoene/expected-lite added [[nodiscard]] on 2024-12-10; see nonstd-lite/expected-lite#74
See https://quuxplusone.github.io/blog/2024/12/08/should-expected-be-nodiscard/ for further rationale, if needed.