// only one multi-type argument per declaration for now
// also allows only one combo right now (File/S with newFile)
// example:
// sS loadTextFile(File/S file) { ... }
svoid tok_multiTypeArguments(LS tok) {
  int i;
  while ((i = jfind(tok, "File/<id> <id>", (_tok, nIdx) ->
      eqGetOneOf(_tok, nIdx+5, "S", "String"))) >= 0) {
    int iOpening = lastIndexOf(tok, i, "("); // TODO: brackets
    int iClosing = findEndOfBracketPart2(tok, iOpening)-1;

    // function name
    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 iArgEnd = i+8; // comma or closing bracket
    LS _args1 = subList(tok, iOpening+1, i);
    LS _args2 = subList(tok, iArgEnd+1, iClosing);
    LS args1 = tok_parseArgsDeclList2(_args1);
    LS args2 = tok_parseArgsDeclList2(_args2);
    LS type = subList(tok, iType-1, iName);
    bool isVoid = containsOneOf(codeTokens(type), javaxVoidAliases());
    //printVars(+expr, +_args1, +_args2, +args1, +args2, +type, +isVoid);
    
    S argName = tok.get(i+6);
    S mainType = tok.get(i), altType = tok.get(i+4);
    S converter = "newFile";
    S expr = converter + "(" + argName + ")";
    
    S rewrittenHead = joinSubList(tok, iStart, iOpening+1)
      + joinWithComma(concatLists(
          args1,
          ll(altType + " " + argName),
          args2)) + ")";
    replaceTokens_reTok(tok, i, i+7, mainType + " " + argName);
    tokPrepend_reTok(tok, iStart, rewrittenHead + " { "
      + (isVoid ? "" : "return ") + name + "(" + 
        joinWithComma(concatLists(
          map tok_lastIdentifier(args1),
          ll(expr),
          map tok_lastIdentifier(args2))) + "); }\n");
  }
}

Began life as a copy of #1027996