// "optPar int bla = 5;" => "int bla = optPar bla(_, 5);"
svoid tok_optPar(LS tok) {
  jreplace(tok, "boolPar <id>", "optPar bool $2", tokCondition {
    ret eqGetOneOf(tok, i+5, "=", ";");
  });
  
  int i;
  
  while ((i = jfindOneOf(tok, "optPar <id> <id>", "optPar <id> <", "optPar <id> [")) >= 0) {
    int iSemicolon = tok_findEndOfStatement(tok, i)-1;
    int iEquals = indexOf_between(tok, "=", i, iSemicolon);
    clearTokens(tok, i, i+2); // drop optPar
    if (iEquals < 0) { // no initializer
      S var = tok.get(iSemicolon-2);
      S type = joinSubList(tok, i+2, iSemicolon-3);
      if (eqOneOf(type, 'bool, 'boolean))
        tok.set(iSemicolon, " = boolPar " + var + "(_);");
      else
        tok.set(iSemicolon, " = cast optPar " + var + "(_);");
    } else {
      S var = tok.get(iEquals-2);
      tok.set(iEquals, "= optPar " + var + "(_, ");
      tok.set(iSemicolon, ");");
    }
    reTok(tok, i, iSemicolon+1);
  }
}

Began life as a copy of #1010313