public Builder setNestedType(
          int index, com.google.protobuf.DescriptorProtos.DescriptorProto.Builder builderForValue) {
        if (nestedTypeBuilder_ == null) {
          ensureNestedTypeIsMutable();
          nestedType_.set(index, builderForValue.build());
          onChanged();
        } else {
          nestedTypeBuilder_.setMessage(index, builderForValue.build());
        }
        return this;
      }