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We don't consistently handle overflows and numeric as-casts robustly #7151
Description
In various places in the codebase, for various stable/unstable options, we are not very careful with how we handle potential underflow/overflows. The typical pattern looks like
- Plain
a + bora - b(underflow/overflow potential; panic in debug, wraparound in release) as-casts between integral numeric types with different ranges; typical pattern looks likea as isize/a as usize. Typically this has potential for bitwise reinterpretation to do funny things.
Activity
jieyouxu commentedon Sep 29, 2026
(NB: you can obviously use clippy restriction lints on bare arithmetic ops, the tradeoff there is that it makes arithmetic ops quite verbose 😆)