diff --git a/fib_tests.sh b/fib_tests.sh
index 9334147..a78f565 100755
--- a/fib_tests.sh
+++ b/fib_tests.sh
@@ -11,7 +11,24 @@ echo "Compile Straight"
 touch csc_out.wasm && rm csc_out.wasm && scheme --script ./partial_eval.scm fib.kp                && time echo $NUMBER | wasmtime ./csc_out.wasm
 #cp csc_out.wasm comp_fib_dyn.wasm
 
-#exit
+echo "Compile Straight 2"
+#touch csc_out.wasm && rm csc_out.wasm && scheme --script ./partial_eval.scm fib.kp                && time echo $NUMBER | wasm3 ./csc_out.wasm
+touch csc_out.wasm && rm csc_out.wasm && scheme --script ./partial_eval.scm fib2.kp                && time echo $NUMBER | wasmtime ./csc_out.wasm
+
+echo "Python"
+time python3 ./fib.py $NUMBER
+
+echo "Rust Wasm Debug"
+pushd rust_fib
+cargo build --target=wasm32-wasi && time echo $NUMBER | wasmtime target/wasm32-wasi/debug/rust_let.wasm
+popd
+
+echo "Rust Wasm Release"
+pushd rust_fib
+cargo build --release --target=wasm32-wasi && time echo $NUMBER | wasmtime target/wasm32-wasi/release/rust_let.wasm
+popd
+
+exit
 
 echo "Interpret Straight"
 #touch csc_out.wasm && rm csc_out.wasm && scheme --script ./partial_eval.scm fib.kp no_compile     && time echo $NUMBER | wasm3 ./csc_out.wasm
@@ -27,19 +44,19 @@ touch csc_out.wasm && rm csc_out.wasm && scheme --script ./partial_eval.scm fib_
 
 echo "Chez Scheme"
 time scheme --script ./fib.scm $NUMBER
-#
-#echo "Chez Scheme Let"
-#time scheme --script ./fib_let.scm $NUMBER
-#
-#echo "Python"
-#time python3 ./fib.py $NUMBER
-#
-#echo "Python Let"
-#time python3 ./fib_let.py $NUMBER
-#
-#echo "C"
-#clang-11 fib.c -o fib && time ./fib $NUMBER
-#
-#echo "C let"
-#clang-11 fib_let.c -o fib_let && time ./fib_let $NUMBER
+
+echo "Chez Scheme Let"
+time scheme --script ./fib_let.scm $NUMBER
+
+echo "Python"
+time python3 ./fib.py $NUMBER
+
+echo "Python Let"
+time python3 ./fib_let.py $NUMBER
+
+echo "C"
+clang-11 fib.c -o fib && time ./fib $NUMBER
+
+echo "C let"
+clang-11 fib_let.c -o fib_let && time ./fib_let $NUMBER
 
diff --git a/rust_fib/Cargo.lock b/rust_fib/Cargo.lock
new file mode 100644
index 0000000..b108dd7
--- /dev/null
+++ b/rust_fib/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "rust_let"
+version = "0.1.0"
diff --git a/rust_fib/Cargo.toml b/rust_fib/Cargo.toml
new file mode 100644
index 0000000..faed3ac
--- /dev/null
+++ b/rust_fib/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "rust_let"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/rust_fib/src/main.rs b/rust_fib/src/main.rs
new file mode 100644
index 0000000..f55fc9c
--- /dev/null
+++ b/rust_fib/src/main.rs
@@ -0,0 +1,18 @@
+
+use std::io;
+
+fn fib(n: i64) -> i64 {
+    match n {
+        0 => 1,
+        1 => 1,
+        o => fib(o-1) + fib(o-2),
+    }
+}
+
+fn main() {
+    println!("enter number to fib:");
+    let mut buffer = String::new();
+    let stdin = io::stdin();
+    stdin.read_line(&mut buffer).unwrap();
+    println!("{}", fib(buffer.trim().parse::<i64>().unwrap()));
+}
diff --git a/shell.nix b/shell.nix
index 8a9b55a..2aebb58 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,6 +1,8 @@
 
-with import <nixpkgs> { };
-
+let
+    moz_overlay = import (builtins.fetchTarball https://github.com/mozilla/nixpkgs-mozilla/archive/master.tar.gz);
+      nixpkgs = import <nixpkgs> { overlays = [ moz_overlay ]; };
+in with nixpkgs;
 mkShell {
   LANG="en_US.UTF-8";
   nativeBuildInputs = [
@@ -13,5 +15,8 @@ mkShell {
     wasm3
     wasmer
     kakoune
+    #(rustChannelOf { rustToolchain = ./rust-toolchain; }).rust
+    #(rustChannelOf { date = "2022-04-10"; channel = "nightly"; targets = [ "wasm32-wasi" ]; }).rust
+    (latest.rustChannels.nightly.rust.override  {  targets = [ "wasm32-wasi" ]; })
   ];
 }