Refactor initializing tracing-subscriber

examples/form/src/main.rs

@@ -7,15 +7,14 @@
 use axum::{extract::Form, response::Html, routing::get, Router};
 use serde::Deserialize;
 use std::net::SocketAddr;
-use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 
 #[tokio::main]
 async fn main() {
-    tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG").unwrap_or_else(|_| "example_form=debug".into()),
-        ))
-        .with(tracing_subscriber::fmt::layer())
+    tracing_subscriber::fmt()
+        .with_env_filter(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| "example_form=debug".into()),
+        )
         .init();
 
     // build our application with some routes