// only one default argument per declaration for now
svoid tok_defaultArguments(LS tok) {
  int i;
  while ((i = jfind(tok, "<id> default")) >= 0) {
    int iOpening = lastIndexOf(tok, i, "(");
    int iClosing = indexOf(tok, i, ")");
    //S args = joinSubList(tok, iOpening+2, iClosing-1);
    int iName = iOpening-2;
    S name = assertIdentifier(get(tok, iName));
    int iType = tok_leftScanType(tok, iName);
    int iStart = tok_leftScanTypeArgsOpt(tok, iType);
    iStart = leftScanModifiers(tok, iStart);
    print("Found method head: " + joinSubList(tok, iStart, iClosing+1));
    int iEndOfExpr = tok_findEndOfExpression(tok, i+4); // should point at comma or closing bracket
    clearTokens_reTok(tok, i+1, iEndOfExpr);
    LS args1 = tok_parseArgsDeclList2(subList(tok, iOpening+1, i-2));
    LS args2 = tok_parseArgsDeclList2(subList(tok, iEndOfExpr+1, iClosing+2));
    
    S rewrittenHead = joinSubList(tok, iStart, iOpening+1)
      + joinWithComma(concatLists(args1, args2)) + ")";
    bool isVoid = eqGet(tok, iType, "void");
    tokPrepend_reTok(tok, iStart, rewrittenHead + " { "
      + (isVoid ? "" : "return ") + name + "(" + 
        joinWithComma(concatLists(
          map tok_lastIdentifier(args1),
          ll(joinSubList(tok, i+4, iEndOfExpr)),
          map tok_lastIdentifier(args2))) + "); }\n");
  }
}