diff --git a/Cargo.lock b/Cargo.lock
index da15124..7688c33 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,201 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+
+[[package]]
+name = "log"
+version = "0.4.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
+
 [[package]]
 name = "lriamol"
 version = "0.1.0"
+dependencies = [
+ "tracing",
+ "tracing-subscriber",
+]
+
+[[package]]
+name = "nu-ansi-term"
+version = "0.46.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77a8165726e8236064dbb45459242600304b42a5ea24ee2948e18e023bf7ba84"
+dependencies = [
+ "overload",
+ "winapi",
+]
+
+[[package]]
+name = "once_cell"
+version = "1.18.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
+
+[[package]]
+name = "overload"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b15813163c1d831bf4a13c3610c05c0d03b39feb07f7e09fa234dac9b15aaf39"
+
+[[package]]
+name = "pin-project-lite"
+version = "0.2.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8afb450f006bf6385ca15ef45d71d2288452bc3683ce2e2cacc0d18e4be60b58"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "134c189feb4956b20f6f547d2cf727d4c0fe06722b20a0eec87ed445a97f92da"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.33"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5267fca4496028628a95160fc423a33e8b2e6af8a5302579e322e4b520293cae"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "sharded-slab"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f40ca3c46823713e0d4209592e8d6e826aa57e928f09752619fc696c499637f6"
+dependencies = [
+ "lazy_static",
+]
+
+[[package]]
+name = "smallvec"
+version = "1.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "942b4a808e05215192e39f4ab80813e599068285906cc91aa64f923db842bd5a"
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e96b79aaa137db8f61e26363a0c9b47d8b4ec75da28b7d1d614c2303e232408b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "thread_local"
+version = "1.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3fdd6f064ccff2d6567adcb3873ca630700f00b5ad3f060c25b5dcfd9a4ce152"
+dependencies = [
+ "cfg-if",
+ "once_cell",
+]
+
+[[package]]
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+version = "0.1.40"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c3523ab5a71916ccf420eebdf5521fcef02141234bbc0b8a49f2fdc4544364ef"
+dependencies = [
+ "pin-project-lite",
+ "tracing-attributes",
+ "tracing-core",
+]
+
+[[package]]
+name = "tracing-attributes"
+version = "0.1.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34704c8d6ebcbc939824180af020566b01a7c01f80641264eba0999f6c2b6be7"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
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+version = "0.1.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c06d3da6113f116aaee68e4d601191614c9053067f9ab7f6edbcb161237daa54"
+dependencies = [
+ "once_cell",
+ "valuable",
+]
+
+[[package]]
+name = "tracing-log"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f751112709b4e791d8ce53e32c4ed2d353565a795ce84da2285393f41557bdf2"
+dependencies = [
+ "log",
+ "once_cell",
+ "tracing-core",
+]
+
+[[package]]
+name = "tracing-subscriber"
+version = "0.3.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "30a651bc37f915e81f087d86e62a18eec5f79550c7faff886f7090b4ea757c77"
+dependencies = [
+ "nu-ansi-term",
+ "sharded-slab",
+ "smallvec",
+ "thread_local",
+ "tracing-core",
+ "tracing-log",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
+
+[[package]]
+name = "valuable"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "830b7e5d4d90034032940e4ace0d9a9a057e7a45cd94e6c007832e39edb82f6d"
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/Cargo.toml b/Cargo.toml
index cb6fa8a..77e2820 100644
--- a/Cargo.toml
+++ b/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]
+tracing = "0.1.40"
+tracing-subscriber = "0.3.17"
diff --git a/flake.lock b/flake.lock
index 8efbabe..c2790c8 100644
--- a/flake.lock
+++ b/flake.lock
@@ -37,10 +37,27 @@
         "type": "github"
       }
     },
+    "nixpkgs-mozilla": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1695805681,
+        "narHash": "sha256-1ElPLD8eFfnuIk0G52HGGpRtQZ4QPCjChRlEOfkZ5ro=",
+        "owner": "mozilla",
+        "repo": "nixpkgs-mozilla",
+        "rev": "6eabade97bc28d707a8b9d82ad13ef143836736e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "mozilla",
+        "repo": "nixpkgs-mozilla",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "naersk": "naersk",
         "nixpkgs": "nixpkgs",
+        "nixpkgs-mozilla": "nixpkgs-mozilla",
         "utils": "utils"
       }
     },
diff --git a/flake.nix b/flake.nix
index 4faf3e9..0e0d083 100644
--- a/flake.nix
+++ b/flake.nix
@@ -7,20 +7,43 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
 
+    nixpkgs-mozilla = {
+      url = "github:mozilla/nixpkgs-mozilla";
+      flake = false;
+    };
+
     utils.url = "github:numtide/flake-utils";
   };
 
   outputs = {
     self,
     nixpkgs,
+    nixpkgs-mozilla,
     utils,
     naersk,
   }:
     utils.lib.eachDefaultSystem (system: let
-      pkgs = import nixpkgs {inherit system;};
-      naersk-lib = pkgs.callPackage naersk {};
+      pkgs = (import nixpkgs) {
+        inherit system;
+
+        overlays = [
+          (import nixpkgs-mozilla)
+        ];
+      };
+
+      toolchain =
+        (pkgs.rustChannelOf {
+          rustToolchain = ./rust-toolchain.toml;
+          sha256 = "sha256-rLP8+fTxnPHoR96ZJiCa/5Ans1OojI7MLsmSqR2ip8o=";
+        })
+        .rust;
+
+      naersk' = pkgs.callPackage naersk {
+        cargo = toolchain;
+        rustc = toolchain;
+      };
     in {
-      packages.default = naersk-lib.buildPackage ./.;
+      packages.default = naersk'.buildPackage ./.;
       formatter = nixpkgs.legacyPackages.${system}.alejandra;
       checks = {
         inherit (self.packages.${system}) default;
@@ -28,14 +51,7 @@
       };
       devShell = with pkgs;
         mkShell {
-          buildInputs = [
-            cargo
-            rustc
-            rustfmt
-            pre-commit
-            rustPackages.clippy
-            rust-analyzer
-          ];
+          buildInputs = [toolchain];
           RUST_SRC_PATH = rustPlatform.rustLibSrc;
         };
     });
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..483bfad
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,3 @@
+[toolchain]
+channel = "1.73.0"
+components = ["rustfmt", "clippy", "rust-analysis", "cargo", "rust-analyzer"]
diff --git a/src/main.rs b/src/main.rs
index 45ba317..7855f4d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,43 +1,38 @@
-#![warn(
-    clippy::all,
+#![deny(clippy::all)]
+#![allow(clippy::blanket_clippy_restriction_lints)]
+#![forbid(
     clippy::style,
-    clippy::absolute_paths,
     clippy::pedantic,
     clippy::nursery,
+    clippy::restriction,
     // clippy::cargo
 )]
 
 //! my code and notes from the book "Learn Rust in a Month of Lunches"
 
+use tracing::info;
+use tracing_subscriber::fmt::init as init_trace_logger;
+
 /// a doc comment - use `cargo doc --open` to see it?
 fn main() {
-    // ch 1
-    let c: char = '\u{D1EA}';
-    println!("Hello, world! {c}");
+    init_trace_logger();
 
-    // ch 2
-    let bytes = b"yoyoyo";
-    println!("Hello, bytes! {bytes:?}");
+    {
+        // ch 1
+        let my_char = '\u{D1EA}';
+        info!("Hello, world! {my_char}");
+    };
 
-    let me = "meeeeeeeeeeeeeeeeeeeeeeeeeee";
-    println!("Hello, {me: <4.12}, meet the real {me}.");
+    {
+        // ch 2
+        let bytes = b"yoyoyo";
+        info!("Hello, bytes! {bytes:?}");
+    };
 
-    // ch 3
-    let children = 5;
-    let married = true;
-
-    // match guards
-    match (children, married) {
-        (children, married) if !married => {
-            println!("Not married with {children} kids");
-        }
-        (children, married) if children == 0 && married => {
-            println!("Married but no children");
-        }
-        _ => {
-            println!("Married? {married}. Number of children: {children}.");
-        }
-    }
+    {
+        let me = "meeeeeeeeeeeeeeeeeeeeeeeeeee";
+        info!("Hello, {me: <4.12}, meet the real {me}.");
+    };
 }
 
 // if I were to write a webapp, I would like to avoid postgres