docs: private static SoyMsgSelectPart buildMsgPartForSelect(
        MsgSelectNode msgSelectNode, MsgNode msgNode) {
  
      // This is the list of the cases.
      ImmutableList.Builder<SoyMsgPart.Case<String>> selectCases = ImmutableList.builder();
  
      for (CaseOrDefaultNode child : msgSelectNode.getChildren()) {
        ImmutableList<SoyMsgPart> caseMsgParts =
            buildMsgPartsForChildren((MsgBlockNode) child, msgNode);
        String caseValue;
        if (child instanceof MsgSelectCaseNode) {
          caseValue = ((MsgSelectCaseNode) child).getCaseValue();
        } else if (child instanceof MsgSelectDefaultNode) {
          caseValue = null;
        } else {
          throw new AssertionError("Unidentified node under a select node.");
        }
        selectCases.add(SoyMsgPart.Case.create(caseValue, caseMsgParts));
      }
  
      return new SoyMsgSelectPart(msgNode.getSelectVarName(msgSelectNode), selectCases.build());
    }