svoid tok_switchableFields(LS tok) {
  int i = -1;
  while ((i = jfind(tok, i+1, "switchable <id>") >= 0) {
    S var = getVarDeclarationName(subList(tok, i));
    replaceTokens(tok, i, i+2, "sbool _switchableField_" + var + " = true;");
  }
}