src/tools/clippy/clippy_lints/src/methods/iterator_step_by_zero.rs

   1 use crate::consts::{constant, Constant};
   2 use crate::utils::{match_trait_method, paths, span_lint};
   3 use rustc_hir as hir;
   4 use rustc_lint::LateContext;
   5
   6 use super::ITERATOR_STEP_BY_ZERO;
   7
   8 pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &hir::Expr<'_>, args: &'tcx [hir::Expr<'_>]) {
   9     if match_trait_method(cx, expr, &paths::ITERATOR) {
  10         if let Some((Constant::Int(0), _)) = constant(cx, cx.typeck_results(), &args[1]) {
  11             span_lint(
  12                 cx,
  13                 ITERATOR_STEP_BY_ZERO,
  14                 expr.span,
  15                 "`Iterator::step_by(0)` will panic at runtime",
  16             );
  17         }
  18     }
  19 }