private CodeBlock forLoopMethodBody() {
      return loopMethodBody(
          "[",
          "]",
          CodeBlock.of("for (int i = 0; i < value.length(); i++)"),
          CodeBlock.of("value.get(i)"));
    }
Parameter object to simplify the branches of {@link #format(CodeBlock, CodeBlock,
TypeMirror)} that call a delegate method.
value/src/main/java/com/google/auto/value/extension/toprettystring/processor/ToPrettyStringExtension.java