var github.com/golang/protobuf/proto.extensionCache

3 uses

	github.com/golang/protobuf/proto (current package)
		registry.go#L292: var extensionCache sync.Map // map[messageName]extensionsByNumber
		registry.go#L303: 	v, _ := extensionCache.Load(s)
		registry.go#L321: 	extensionCache.Store(s, xs)