chore: eliminate Result::unwrap

Justfile

@@ -1,15 +1,15 @@
 [no-exit-message]
 @repl:
-  RUST_LOG=none cargo run --bin repl
+  cargo run --bin repl
 
 [no-exit-message]
 @eval expr:
-  RUST_LOG=none cargo run --bin eval -- '{{expr}}'
+  cargo run --bin eval -- '{{expr}}'
 
 [no-exit-message]
 @replr:
-  RUST_LOG=none cargo run --bin repl --release
+  cargo run --bin repl --release
 
 [no-exit-message]
 @evalr expr:
-  RUST_LOG=none cargo run --bin eval --release -- '{{expr}}'
+  cargo run --bin eval --release -- '{{expr}}'