const google.golang.org/protobuf/internal/encoding/messageset.ExtensionName

4 uses

	google.golang.org/protobuf/internal/encoding/messageset (current package)
		messageset.go#L43: const ExtensionName = "message_set_extension"
		messageset.go#L54: 	case fd.Name() != ExtensionName:

	google.golang.org/protobuf/internal/impl
		legacy_extension.go#L129: 		xd.L0.FullName = xd.L0.FullName.Append(messageset.ExtensionName)

	google.golang.org/protobuf/reflect/protoregistry
		registry.go#L687: 				field := field.Append(messageset.ExtensionName)