logging exercise: improved instructions, updated version of env_logger

exercise/logging/Cargo.toml

@@ -6,7 +6,9 @@ edition = "2018"
 
 [dependencies]
 # I'm glad you came to add the `log` dependency! I got it all ready for you, just uncomment:
-log = "0.4"
+#
+# log = "0.4"
 
 # And here's the env_logger dependency that you'll need in main.rs
-env_logger = "0.8"
+#
+# env_logger = "0.9"

exercise/logging/src/lib.rs

@@ -1,9 +1,10 @@
-// 1. Bring the macros error, warn, info, debug, and trace into scope from the log package with a
+// 1. Bring the macros `error, warn, info, debug, trace` into scope from the log package with a
 // `use` statement.
 //
-// - You should be able to run `cargo build --lib` successfully after each step.
+// You should be able to run `cargo build --lib` successfully after this step (and each step in this
+// file)
 //
-// Hint: You may need to update Cargo.toml first
+// Hint: You need to update Cargo.toml to add the `log` dependency, first.
 
 #[derive(Debug)]
 pub struct Frog {
@@ -17,14 +18,13 @@ impl Frog {
         Default::default()
     }
     pub fn hop(&mut self) {
-        // 3. Use info!() to log that a Frog hopped, and how much energy is left
         self.energy -= 1;
+        // 3. Use info!() to log that a Frog hopped, and how much energy is left
         if self.energy == 0 {
             // 4. Use warn!() to warn that the frog will go to sleep since he ran out of energy
             self.sleep();
         }
     }
-    // info, error
     pub fn sleep(&mut self) {
         if !self.sleeping {
             // 5. Use error!() to log a (non-fatal) error stating that the Frog is already asleep

exercise/logging/src/main.rs

@@ -2,16 +2,16 @@
 
 use frogger::Frog;
 
-// You did 1-6 in lib.rs already, right?
+// You did #1-#6 in lib.rs already, right?
 //
-// 7. Bring env_logger into scope. You might need to update Cargo.toml, first.
+// 7. Update Cargo.toml to add the `env_logger` dependency
 
 fn main() {
-    // 8. Initialize env_logger using the init() function
+    // 8. Initialize env_logger using the init() function at the top level of the library
 
     // 9. Run this program with `cargo run` and take a look at the default output.
     // - Now run it again with an explicit log level, like `RUST_LOG=info cargo run`
-    // - ...and `RUST_LOG=trace cargo run`
+    // - or `RUST_LOG=trace cargo run`
     let mut skippy = Frog::new();
     skippy.hop();
     skippy.hop();