References: google.golang.org/protobuf/internal/genid.FieldDescriptorProto_LABEL_REQUIRED_enum

const google.golang.org/protobuf/internal/genid.FieldDescriptorProto_LABEL_REQUIRED_enum_value

one use

	google.golang.org/protobuf/internal/genid (current package)
		descriptor_gen.go#L354: 	FieldDescriptorProto_LABEL_REQUIRED_enum_value = 2

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