vtcode 0.123.7

A Rust-based terminal coding agent with modular architecture supporting multiple LLM providers
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id: prefer-iterator-sum
language: Rust
severity: hint
message: Use `.sum()` instead of manual folding with addition.
note: |
  `.fold(0, |acc, x| acc + x)` is equivalent to `.sum()` for numeric types
  that implement `Sum`. The `sum()` method is more expressive and lets the
  compiler optimize the reduction. This rule matches folds that only add;
  folds with complex logic or non-zero initializers are not candidates.
rule:
  any:
    - pattern: $ITER.fold(0, |$ACC, $X| $ACC + $X)
    - pattern: $ITER.fold(0.0, |$ACC, $X| $ACC + $X)
    - pattern: $ITER.fold(0u32, |$ACC, $X| $ACC + $X)
    - pattern: $ITER.fold(0u64, |$ACC, $X| $ACC + $X)
    - pattern: $ITER.fold(0i32, |$ACC, $X| $ACC + $X)
    - pattern: $ITER.fold(0i64, |$ACC, $X| $ACC + $X)
fix: $ITER.sum()
files:
  - "**/*.rs"