// doesn't reTok
static LS tok_javaCallsToLeftArrowStyle(LS tok) {
  bigLoop: for (int i = 1; i < l(tok); i += 2) {
    if (isIdentifier(tok.get(i)) && eqGet(tok, i+2, "(")) {
      int iArg = i+4;
      while true {
        int iArgEnd = tok_endOfExpression(tok, iArg)+1;
        i = iArgEnd+2;
        
        // recurse for argument
        tok_javaCallsToLeftArrowStyle(subList(tok, iArg-1, iArgEnd));
        
        if (!eqGet(tok, iArgEnd, ","))
          continue bigLoop;
      }
    }
  }
}