warp+tokio example from ch1 running

Cargo.toml

@@ -6,3 +6,5 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+tokio = { version = "1.2", features = ["full"] }
+warp = "0.3.7"

src/main.rs

@@ -1,3 +1,9 @@
-fn main() {
-    println!("Hello, world!");
+// Example from Gruber book Ch1
+
+use warp::Filter;
+
+#[tokio::main]
+async fn main() {
+    let hello = warp::get().map(|| "Hello World!");
+    warp::serve(hello).run(([127, 0, 0, 1], 1337)).await;
 }