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#L53: 	if fd.Name() != ExtensionName {
		messageset.go#L66: 	name := s.Append(ExtensionName)

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