https://wg21.link/#support
`[[nodiscard]]` should be applied to functions where discarding the
return value is most likely a correctness issue.
- https://libcxx.llvm.org/CodingGuidelines.html#apply-nodiscard-where-relevant
The following was implemented in this patch:
- [x] `<compare>`
- [x] `<corotine>`
- [x] `<initializer_list>`
- [x] Integer comparisons
---------
Co-authored-by: Hristo Hristov <zingam@outlook.com>
Co-authored-by: A. Jiang <de34@live.cn>
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