sS gazelle_deepReplaceVars(SS map, S s, O... _) {
  LS tok = javaTokWithBrackets(s);
  ret join(mapCodeTokens(tok, t -> {
    bool round = tok_isRoundBracketed(t);
    bool curly = tok_isCurlyBracketed(t);
    if (!round && !curly) ret getOrKeep(map, t);
    t2 = tok_deRoundOrCurlyBracket(t);
    t3 = gazelle_deepReplaceVars(map, t2, _);
    if (t2 == t3) ret t;
    ret round ? roundBracket(t) : curlyBracket(t);
  }));
}