private static @NotNull OperationRecord replaceFnVariable(@NotNull String oldName,
                                                            @NotNull OperationRecord record,
                                                            @NotNull ChainVariable outerVar,
                                                            @NotNull OptionalToIfContext context) {
    ChainVariable inVar = replaceFnVariable(oldName, record.myInVar, outerVar);
    ChainVariable outVar = replaceFnVariable(oldName, record.myOutVar, outerVar);
    Operation operation = record.myOperation;
    operation.rename(oldName, outerVar, context);
    return new OperationRecord(inVar, outVar, operation);
  }
private static @NotNull OperationRecord replaceFnVariable(@NotNull String oldName,
                                                            @NotNull OperationRecord record,
                                                            @NotNull ChainVariable outerVar,
                                                            @NotNull OptionalToIfContext context)