svoid tok_overridableFunctionDefs(LS tok, Set<S> overriableFunctions_out) {
  int i;
  while ((i = jfind(tok, "static overridable <id>")) >= 0) {
    int bracket = indexOf(tok, "(", i);
    int codeStart = indexOf(tok, "{", bracket);
    S fName = assertIdentifier(tok.get(bracket-2));
    S type = joinSubList(tok, i+4, bracket-3);
    S boxedType = tok_toNonPrimitiveTypes(type);
    S args = joinWithComma(map tok_lastIdentifier(tok_parseArgsDeclList(subList(tok, i))));
    S castIt = eq(type, "Object") ? "" : "(\*type*/)";

    replaceTokens(tok, i, bracket-1, "static Object _override_\*fName*/;\n"
      + "static \*type*/ \*fName*/");
    
    tokAppend(tok, codeStart, " if (_override_\*fName*/ != null) return \*castIt*/ callF(_override_\*fName*/, \*args*/);\n");
    reTok(tok, i, codeStart+1);
    addToCollection(overriableFunctions_out, fName);
  }
}