{"ast_node_type":"other","tokens":[{"end":87,"kind":"keyword","start":0,"text":"cx.sess.psess.env_depinfo.borrow_mut().insert((var,"}]}
    cx.sess.psess.env_depinfo.borrow_mut().insert((var, value.as_ref().ok().copied()));
    let value = lookup_env(cx, var);
    let e = match value {