Add lint #[must_use]
for ring buffer functions
#561
Merged
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This pull request adds
#[must_use]
flag on several ring buffer functions that have side-effects.This lint is in stable Rust now: rust-lang/rust#43302, these changes are noted according to code comment from @whitequark: f65bc8a.
Some test cases and functions are altered due to changes of
#[must_use]
.