79c69112dc
Since Clippy uses the `let_chains` feature, there are many occasions to collapse `if` and `if let` statements.
21 lines
637 B
Rust
21 lines
637 B
Rust
use clippy_utils::consts::{ConstEvalCtxt, Constant};
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use clippy_utils::diagnostics::span_lint;
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use clippy_utils::is_trait_method;
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use rustc_hir as hir;
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use rustc_lint::LateContext;
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use rustc_span::sym;
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use super::ITERATOR_STEP_BY_ZERO;
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pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &hir::Expr<'_>, arg: &'tcx hir::Expr<'_>) {
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if is_trait_method(cx, expr, sym::Iterator)
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&& let Some(Constant::Int(0)) = ConstEvalCtxt::new(cx).eval(arg)
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{
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span_lint(
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cx,
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ITERATOR_STEP_BY_ZERO,
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expr.span,
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"`Iterator::step_by(0)` will panic at runtime",
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);
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}
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}
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