$ echo 'print("Koi")' | koi -s 
thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', src/main.rs:77:51
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

> rustc --version
rustc 1.54.0-nightly (c1e8f3a58 2021-05-30)

> cargo install --git https://github.com/eliaperantoni/Koi
...
warning: 3 warnings emitted

    Finished release [optimized] target(s) in 2m 23s
  Installing /home/user/.asdf/installs/rust/nightly/bin/koi
   Installed package `koi v0.1.0 (https://github.com/eliaperantoni/Koi#caa13f7b)` (executable `koi`)

/home/user/tmp/koi/examples(master)> asdf reshim
/home/user/tmp/koi/examples(master)> koi
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 2, kind: NotFound, message: "No such file or directory" }', src/main.rs:67:75
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
/home/user/tmp/koi/examples(master)> koi import.koi
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 2, kind: NotFound, message: "No such file or directory" }', src/interp/mod.rs:150:60
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

ls -l *.pdf

print(something()) # This would cause a panic because it is declared after being called.

fn something() {
  return "nothing"
}

fn something() # Mostly just syntactic sugar.

print(something())

fn something() {
  return "nothing"
}