chore: fix tracing-macros::dbg (#1054)

…and the `factorial` example.

Author: dvdplm

tracing-macros/Cargo.toml

@@ -17,11 +17,10 @@ keywords = ["logging", "tracing"]
 license = "MIT"
 
 [dependencies]
-tracing = "0.1.18"
+tracing = "0.1.20"
 
 [dev-dependencies]
-tracing-log = "0.1"
-env_logger = "0.7"
+tracing-subscriber = "0.2"
 
 [badges]
 maintenance = { status = "experimental" }

tracing-macros/examples/factorial.rs

@@ -12,9 +12,7 @@ fn factorial(n: u32) -> u32 {
 }
 
 fn main() {
-    env_logger::Builder::new().parse_filters("trace").init();
-    #[allow(deprecated)]
-    let subscriber = tracing_log::TraceLogger::new();
+    let subscriber = tracing_subscriber::fmt().finish();
 
     tracing::subscriber::with_default(subscriber, || dbg!(factorial(4)));
 }