{"ast_node_type":"variable","tokens":[{"end":79,"kind":"keyword","start":0,"text":"let"}]}
    let v = &t.0.do_stuff();        // `&` is for result -> no deref, no parens
    let v = t.0.do_stuff();         // no deref, no parens
    // deref: `s1` is `&&S`, but method called is on `&S` -> there might be a method accepting `&&S`