{"ast_node_type":"variable","tokens":[{"end":53,"kind":"keyword","start":0,"text":"if"}]}
        if let ExprKind::Call(func, args) = expr.kind
    fn check_memory_fence(cx: &LateContext<'_>, expr: &Expr<'_>) {
            && let ExprKind::Path(ref func_qpath) = func.kind