diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index 56dd2795c..6e9b7f685 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -566,6 +566,17 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Loops { ) = (pat, &match_expr.kind) { let iter_expr = &method_args[0]; + + // Don't lint when the iterator is recreated on every iteration + if_chain! { + if let ExprKind::MethodCall(..) | ExprKind::Call(..) = iter_expr.kind; + if let Some(iter_def_id) = get_trait_def_id(cx, &paths::ITERATOR); + if implements_trait(cx, cx.tables.expr_ty(iter_expr), iter_def_id, &[]); + then { + return; + } + } + let lhs_constructor = last_path_segment(qpath); if method_path.ident.name == sym!(next) && match_trait_method(cx, match_expr, &paths::ITERATOR)