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Rust iterator chains replace index bookkeeping with lazy, composable adapters. A worked filter/map/sum example, the laziness gotcha, borrowing choices, and when a plain loop is still the right call.
Goal: configure Rust compiler lints so that useful alerts about unused variables and other code quality issues are visible, while reducing irrelevant noise that can hide genuine problems. Constraints: deciding which lints to promote to error level, which to keep as warnings, and how to apply temporary overrides via cargo clippy flags or RUSTFLAGS without aff
rust