func main() { m := macaron.Classic() // Define a route that renders an HTML template m.Get("/", func(ctx *macaron.Context) { ctx.Data["Title"] = "Hello, World!" ctx.HTML(200, "template.html") }) m.Run() }In this example, we define a route using the `m.Get()` function, which matches incoming GET requests to the root URL ("/") and passes them to a handler function. The handler function takes a pointer to a `macaron.Context` struct as its argument, which we can use to access various properties of the incoming request. Inside the handler function, we create a new key-value pair in the `ctx.Data` map, which we can use to pass data to our HTML template. Then we call the `ctx.HTML()` method to render a template called `template.html`. Overall, the `github.com/unknwon/macaron` package provides a nice set of tools for building web applications in Go, and its use of the `Context` struct makes it easy to manage state and interact with incoming requests.