clean up structured logging example

README.md

@@ -106,17 +106,22 @@ If you enable the `kv` feature, you can associate structured data with your log
 use log::{info, trace, warn};
 
 pub fn shave_the_yak(yak: &mut Yak) {
-    trace!(target = "yak_events", yak:serde = yak; "Commencing yak shaving");
+    // `yak:serde` will capture `yak` using its `serde::Serialize` impl
+    //
+    // You could also use `:?` for `Debug`, or `:%` for `Display`. For a
+    // full list, see the `log` crate documentation
+    trace!(target = "yak_events", yak:serde; "Commencing yak shaving");
 
     loop {
         match find_a_razor() {
             Ok(razor) => {
-                info!(razor = razor; "Razor located");
+                info!(razor; "Razor located");
                 yak.shave(razor);
                 break;
             }
-            Err(err) => {
-                warn!(err:err; "Unable to locate a razor, retrying");
+            Err(e) => {
+                // `e:err` will capture `e` using its `std::error::Error` impl
+                warn!(e:err; "Unable to locate a razor, retrying");
             }
         }
     }

src/lib.rs

@@ -102,17 +102,17 @@
 //! use log::{info, warn};
 //!
 //! pub fn shave_the_yak(yak: &mut Yak) {
-//!     info!(target: "yak_events", yak:serde = yak; "Commencing yak shaving");
+//!     info!(target: "yak_events", yak:serde; "Commencing yak shaving");
 //!
 //!     loop {
 //!         match find_a_razor() {
 //!             Ok(razor) => {
-//!                 info!(razor = razor; "Razor located");
+//!                 info!(razor; "Razor located");
 //!                 yak.shave(razor);
 //!                 break;
 //!             }
-//!             Err(err) => {
-//!                 warn!(err:err; "Unable to locate a razor, retrying");
+//!             Err(e) => {
+//!                 warn!(e:err; "Unable to locate a razor, retrying");
 //!             }
 //!         }
 //!     }