A-categoryL-nurserygood first issue
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説明
Replacing .unwrap_or(Vec::new()) with .unwrap_or_default() doesn't do anything for performance, they produce identical machine code with optimizations: https://rust.godbolt.org/z/hzTdazGqW.
Perhaps the lint category could be changed or it could be changed to not detect cases where it's not actually a performance warning?