{"ast_node_type":"impl","tokens":[{"end":38,"kind":"keyword","start":0,"text":"///"}]}
    /// or to an impl block or module.
    /// Checks that `#[optimize(..)]` is applied to a function/closure/method,
    fn check_optimize(&self, hir_id: HirId, attr_span: Span, span: Span, target: Target) {