use clippy_utils::diagnostics::span_lint_and_sugg; use clippy_utils::is_trait_method; use clippy_utils::source::snippet; use rustc_errors::Applicability; use rustc_hir as hir; use rustc_lint::LateContext; use rustc_span::sym; use super::ITER_SKIP_NEXT; pub(super) fn check(cx: &LateContext<'_>, expr: &hir::Expr<'_>, recv: &hir::Expr<'_>, arg: &hir::Expr<'_>) { // lint if caller of skip is an Iterator if is_trait_method(cx, expr, sym::Iterator) { span_lint_and_sugg( cx, ITER_SKIP_NEXT, expr.span.trim_start(recv.span).unwrap(), "called `skip(..).next()` on an iterator", "use `nth` instead", format!(".nth({})", snippet(cx, arg.span, "..")), Applicability::MachineApplicable, ); } }