public static void cppOutputWhen(Cons tree) {
    ((OutputStream)(Stella.$CURRENT_STREAM$.get())).nativeStream.print("if (");
    Stella_Object.cppOutputStatement(tree.value);
    ((OutputStream)(Stella.$CURRENT_STREAM$.get())).nativeStream.println(") {");
    Stella.cppBumpIndent();
    Stella_Object.cppOutputStatement(tree.rest.value);
    Stella.cppUnbumpIndent();
    Stella.cppIndent();
    ((OutputStream)(Stella.$CURRENT_STREAM$.get())).nativeStream.println("}");
  }