{"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"debug!(\"closure_span:"}]}
        debug!("closure_span: hir_id={:?} expr={:?}", hir_id, expr);
        let expr = &self.infcx.tcx.hir_expect_expr(hir_id).kind;
        if let &hir::ExprKind::Closure(&hir::Closure { kind, fn_decl_span, .. }) = expr {