From 7752d73216578d5961751b5d0535088d384b4aa6 Mon Sep 17 00:00:00 2001
From: Arnaud Bailly <arnaud.bailly@iohk.io>
Date: Sat, 25 Jan 2025 10:45:41 +0100
Subject: Move λ-calcul workshop code to subdirectory
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 rust/.gitignore                 |    1 -
 rust/Cargo.lock                 | 2753 ---------------------------------------
 rust/Cargo.toml                 |   45 -
 rust/README.md                  |   42 -
 rust/cover.sh                   |    4 -
 rust/sample/test.txt            |    5 -
 rust/sample/test01/input        |    1 -
 rust/sample/test01/output       |    1 -
 rust/sample/test02/input        |    6 -
 rust/sample/test02/output       |    4 -
 rust/sample/test03/input        |   12 -
 rust/sample/test03/output       |    9 -
 rust/sample/test_bool.txt       |   15 -
 rust/sample/test_full.txt       |    1 -
 rust/sample/test_let.txt        |    1 -
 rust/sample/test_nat.txt        |    9 -
 rust/sample/test_normal.txt     |    1 -
 rust/src/ast.rs                 |  117 --
 rust/src/io.rs                  |   73 --
 rust/src/lambda.rs              |  292 -----
 rust/src/lib.rs                 |    4 -
 rust/src/main.rs                |   18 -
 rust/src/parser.rs              |  392 ------
 rust/src/tester.rs              |  100 --
 rust/src/web.rs                 |  899 -------------
 rust/templates/leaderboard.html |   50 -
 rust/tests/interpret_test.rs    |   25 -
 27 files changed, 4880 deletions(-)
 delete mode 100644 rust/.gitignore
 delete mode 100644 rust/Cargo.lock
 delete mode 100644 rust/Cargo.toml
 delete mode 100644 rust/README.md
 delete mode 100755 rust/cover.sh
 delete mode 100644 rust/sample/test.txt
 delete mode 100644 rust/sample/test01/input
 delete mode 100644 rust/sample/test01/output
 delete mode 100644 rust/sample/test02/input
 delete mode 100644 rust/sample/test02/output
 delete mode 100644 rust/sample/test03/input
 delete mode 100644 rust/sample/test03/output
 delete mode 100644 rust/sample/test_bool.txt
 delete mode 100644 rust/sample/test_full.txt
 delete mode 100644 rust/sample/test_let.txt
 delete mode 100644 rust/sample/test_nat.txt
 delete mode 100644 rust/sample/test_normal.txt
 delete mode 100644 rust/src/ast.rs
 delete mode 100644 rust/src/io.rs
 delete mode 100644 rust/src/lambda.rs
 delete mode 100644 rust/src/lib.rs
 delete mode 100644 rust/src/main.rs
 delete mode 100644 rust/src/parser.rs
 delete mode 100644 rust/src/tester.rs
 delete mode 100644 rust/src/web.rs
 delete mode 100644 rust/templates/leaderboard.html
 delete mode 100644 rust/tests/interpret_test.rs

(limited to 'rust')

diff --git a/rust/.gitignore b/rust/.gitignore
deleted file mode 100644
index 2f7896d..0000000
--- a/rust/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
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diff --git a/rust/Cargo.lock b/rust/Cargo.lock
deleted file mode 100644
index bdb2dd9..0000000
--- a/rust/Cargo.lock
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diff --git a/rust/Cargo.toml b/rust/Cargo.toml
deleted file mode 100644
index b2eab9c..0000000
--- a/rust/Cargo.toml
+++ /dev/null
@@ -1,45 +0,0 @@
-[package]
-name = "rust"
-version = "0.1.0"
-edition = "2021"
-
-[dependencies]
-rand = {  version = "0.8.5", features = ["small_rng"] }
-serde = { version = "1.0", features = ["derive"] }
-chrono = { version= "0.4.38", features = ["serde"]}
-serde_json = "1.0.128"
-actix-web = "4.9.0"
-env_logger = "0.8"
-log = "0.4"
-futures = "0.3.30"
-async-std = "1.13.0"
-reqwest = "0.12.8"
-tokio = { version = "1.40.0", features = ["rt", "macros", "rt-multi-thread"]}
-clap = { version = "4.5.19", features = ["derive"] }
-proptest = "1.0.0"
-handlebars = { version = "5", features = ["dir_source"] }
-
-[dependencies.uuid]
-version = "1.10.0"
-features = [
-    "v4",                # Lets you generate random UUIDs
-    "fast-rng",          # Use a faster (but still sufficiently random) RNG
-    "macro-diagnostics", # Enable better diagnostics for compile-time UUIDs
-    "serde"
-]
-
-[lib]
-name = "lambda"
-path = "src/lib.rs"
-
-[[bin]]
-name = "eval"
-path = "src/main.rs"
-
-[[bin]]
-name = "tester"
-path = "src/tester.rs"
-
-[[bin]]
-name = "server"
-path = "src/web.rs"
diff --git a/rust/README.md b/rust/README.md
deleted file mode 100644
index 7dfc03b..0000000
--- a/rust/README.md
+++ /dev/null
@@ -1,42 +0,0 @@
-# Rust λ-calcul reference implementation
-
-This directory contains a reference implementation of a normal order semantics λ-calculus based language.
-Current syntax is based on S-expressions, ie. Lisp. There is a command-line interpreter for batch and interactive evaluation of input, and an embryonic tester daemon.
-
-# Tester
-
-The tester daemon is inspired by [Extreme Startup](https://github.com/rchatley/extreme_startup): It's a REST-ish server and client that allows to repeatedly send λ-terms to a remote execution engine and compare the result against its expectations.
-
-The interaction flow is simple:
-
-* HTTP server starts on some known port (eg. 8080)
-* Client sends a `POST /register` request, passing in as payload a JSON object with a `url` and `name` string fields
-  ```
-  curl -v -X POST -d '{"url":"http://127.0.0.1:8888/eval", "name": "toto"}' -H 'Content-type: application/json' http://localhost:8080/register
-  ```
-* Obviously, client needs to start a HTTP server able to respond to a `GET` request at the given URL
-* If URL is not already registered, server accepts the registration (returning a 200 result) and starts a _testing thread_
-* The _tester_ then repeatedly sends `POST` requests to the client's registered URL
-  * The body of the request is plain text S-expression representing a λ-term
-  * The tester expects the response to be the plain text result of the evaluation of those terms
-* If the client fails to answer, or answers wrongly, the server keeps sending the same request
-* If the client's answer is correct, the server sends another term to evaluate and awards 1 point to the client
-* The `/leaderboard` endpoint provides a crude HTML page listing each clients' current score
-
-## Building
-
-This software is written in Rust (sorry @xvdw), so one needs a Rust toolchain installed, then:
-
-```
-cargo build && cargo test
-```
-
-## Running
-
-To run the server:
-
-```
-cargo run --bin server
-```
-
-There are `--port` and `--host` arguments should one want to change the defaults `127.0.0.1:8080`
diff --git a/rust/cover.sh b/rust/cover.sh
deleted file mode 100755
index c7befa6..0000000
--- a/rust/cover.sh
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/usr/bin/env bash
-CARGO_INCREMENTAL=0 RUSTFLAGS='-Cinstrument-coverage' LLVM_PROFILE_FILE='cargo-test-%p-%m.profraw' cargo test
-rm -fr target/coverage/html
-grcov . --binary-path ./target/debug/deps/ -s . -t html --branch --ignore-not-existing --ignore '../*' --ignore "/*" -o target/coverage/html
diff --git a/rust/sample/test.txt b/rust/sample/test.txt
deleted file mode 100644
index 76dc68a..0000000
--- a/rust/sample/test.txt
+++ /dev/null
@@ -1,5 +0,0 @@
-12
-foo
-  true
-
-(x x)
diff --git a/rust/sample/test01/input b/rust/sample/test01/input
deleted file mode 100644
index 48082f7..0000000
--- a/rust/sample/test01/input
+++ /dev/null
@@ -1 +0,0 @@
-12
diff --git a/rust/sample/test01/output b/rust/sample/test01/output
deleted file mode 100644
index 48082f7..0000000
--- a/rust/sample/test01/output
+++ /dev/null
@@ -1 +0,0 @@
-12
diff --git a/rust/sample/test02/input b/rust/sample/test02/input
deleted file mode 100644
index 81a0443..0000000
--- a/rust/sample/test02/input
+++ /dev/null
@@ -1,6 +0,0 @@
-(def pair (lam (a b f) (f a b)))
-
-(def fst (lam p (p (lam ( a b) a))))
-(def snd (lam p (p (lam ( a b) b))))
-
-(fst (snd (pair 1 (pair 2 0))))
diff --git a/rust/sample/test02/output b/rust/sample/test02/output
deleted file mode 100644
index c61e10e..0000000
--- a/rust/sample/test02/output
+++ /dev/null
@@ -1,4 +0,0 @@
-true
-true
-true
-2
diff --git a/rust/sample/test03/input b/rust/sample/test03/input
deleted file mode 100644
index 6cff466..0000000
--- a/rust/sample/test03/input
+++ /dev/null
@@ -1,12 +0,0 @@
-(def zero (lam (f s) s))
-(def succ (lam (n f s) (f (n f s))))
-
-(def one (succ zero))
-(def two (succ one))
-(def three (succ two))
-(def four (succ three))
-(def five (succ four))
-
-(def plus (lam (a b f s) (a f (b f s))))
-
-(plus one three)
diff --git a/rust/sample/test03/output b/rust/sample/test03/output
deleted file mode 100644
index fd56297..0000000
--- a/rust/sample/test03/output
+++ /dev/null
@@ -1,9 +0,0 @@
-true
-true
-true
-true
-true
-true
-true
-true
-four
diff --git a/rust/sample/test_bool.txt b/rust/sample/test_bool.txt
deleted file mode 100644
index a1b1309..0000000
--- a/rust/sample/test_bool.txt
+++ /dev/null
@@ -1,15 +0,0 @@
-(def True (lam (x y) x))
-(def False (lam (x y) y))
-(def and (lam (a b) (a b False)))
-(def or (lam (a b) (a True b)))
-(def not (lam a (a False True)))
-
-(and True True)
-(and True False)
-(and False True)
-(and False False)
-
-(or True True)
-(or True False)
-(or False True)
-(or False False)
diff --git a/rust/sample/test_full.txt b/rust/sample/test_full.txt
deleted file mode 100644
index ece76b8..0000000
--- a/rust/sample/test_full.txt
+++ /dev/null
@@ -1 +0,0 @@
-(((lam x (lam x x)) 13) true)
diff --git a/rust/sample/test_let.txt b/rust/sample/test_let.txt
deleted file mode 100644
index 6027cd0..0000000
--- a/rust/sample/test_let.txt
+++ /dev/null
@@ -1 +0,0 @@
-(let (foo (lam x x)) ((let (foo foo) foo) 13))
diff --git a/rust/sample/test_nat.txt b/rust/sample/test_nat.txt
deleted file mode 100644
index 81a6e9d..0000000
--- a/rust/sample/test_nat.txt
+++ /dev/null
@@ -1,9 +0,0 @@
-(def pair (lam (a b f) (f a b)))
-(def fst (lam p (p (lam (a b) a))))
-(def snd (lam p (p (lam (a b) b))))
-
-(def zero (lam (f s) s))
-(def succ (lam (n f s) (f (n f s))))
-
-(def is-zero (lam n
-   (n (lam x False) true)))
diff --git a/rust/sample/test_normal.txt b/rust/sample/test_normal.txt
deleted file mode 100644
index 00abde9..0000000
--- a/rust/sample/test_normal.txt
+++ /dev/null
@@ -1 +0,0 @@
-((lam x 1) ((lam x (x x)) (lam x (x x))))
diff --git a/rust/src/ast.rs b/rust/src/ast.rs
deleted file mode 100644
index d0f1d6f..0000000
--- a/rust/src/ast.rs
+++ /dev/null
@@ -1,117 +0,0 @@
-use proptest::{
-    prelude::*,
-    string::{string_regex, RegexGeneratorStrategy},
-};
-use serde::{Deserialize, Serialize};
-use std::fmt::{self, Display};
-
-#[derive(Debug, PartialEq, Clone, Serialize, Deserialize)]
-pub enum Value {
-    Num(i32),
-    Bool(bool),
-    Sym(String),
-    App(Box<Value>, Box<Value>),
-    Lam(String, Box<Value>),
-    Def(String, Box<Value>),
-    Let(String, Box<Value>, Box<Value>),
-}
-
-use Value::*;
-
-impl Value {
-    /// Return the spine of an application
-    fn spine(&self) -> Vec<Value> {
-        match self {
-            App(l, r) => {
-                let mut spine = l.spine();
-                spine.push(*r.clone());
-                spine
-            }
-            _ => vec![self.clone()],
-        }
-    }
-}
-
-impl Display for Value {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Value::Num(i) => write!(f, "{}", i),
-            Value::Bool(b) => write!(f, "{}", b),
-            Value::Sym(s) => write!(f, "{}", s),
-            Value::App(_, _) => {
-                let app = self
-                    .spine()
-                    .iter()
-                    .map(|v| v.to_string())
-                    .collect::<Vec<String>>()
-                    .join(" ");
-                write!(f, "({})", app)
-            }
-            Value::Lam(var, body) => write!(f, "(lam {} {})", var, body),
-            Value::Def(var, value) => write!(f, "(def {} {})", var, value),
-            Value::Let(var, value, body) => write!(f, "(let ({} {}) {})", var, value, body),
-        }
-    }
-}
-
-pub const IDENTIFIER: &str = "\\pL(\\pL|\\pN)*";
-
-pub fn identifier() -> RegexGeneratorStrategy<String> {
-    string_regex(IDENTIFIER).unwrap()
-}
-
-pub fn ascii_identifier() -> RegexGeneratorStrategy<String> {
-    string_regex("[a-zA-Z][a-zA-Z0-9]*").unwrap()
-}
-
-impl Arbitrary for Value {
-    type Parameters = ();
-    type Strategy = BoxedStrategy<Self>;
-
-    fn arbitrary_with(_args: ()) -> Self::Strategy {
-        let any_num = any::<i32>().prop_map(Num);
-        let any_bool = any::<bool>().prop_map(Bool);
-        let leaf = prop_oneof![
-            any_num,
-            any_bool,
-            // see https://unicode.org/reports/tr18/#General_Category_Property for one letter unicode categories
-            identifier().prop_map(Sym),
-        ];
-        let expr = leaf.prop_recursive(4, 128, 5, move |inner| {
-            prop_oneof![
-                (inner.clone(), inner.clone()).prop_map(|(l, r)| App(Box::new(l), Box::new(r))),
-                (identifier(), inner.clone()).prop_map(|(var, body)| Lam(var, Box::new(body))),
-                (identifier(), inner.clone(), inner.clone()).prop_map(|(var, body, expr)| {
-                    Value::Let(var, Box::new(body), Box::new(expr))
-                }),
-            ]
-        });
-        prop_oneof![
-            expr.clone(),
-            (identifier(), expr).prop_map(|(var, body)| Def(var, Box::new(body)))
-        ]
-        .boxed()
-    }
-}
-
-#[cfg(test)]
-mod ast_tests {
-
-    use super::Value::{self, *};
-    use proptest::collection::vec;
-    use proptest::prelude::*;
-
-    proptest! {
-
-       #[test]
-        fn display_multiple_applications_as_a_sequence(atoms in vec("[a-z]".prop_map(Sym), 2..10)) {
-            let init  = atoms.first().unwrap().clone();
-            let value = atoms.iter().skip(1).fold(init, |acc, expr| {
-              Value::App(Box::new(acc.clone()), Box::new(expr.clone()))
-            });
-            assert_eq!(value.to_string(),
-                       format!("({})",
-                               atoms.iter().map(|v| v.to_string()).collect::<Vec<String>>().join(" ")));
-      }
-    }
-}
diff --git a/rust/src/io.rs b/rust/src/io.rs
deleted file mode 100644
index 8c628ba..0000000
--- a/rust/src/io.rs
+++ /dev/null
@@ -1,73 +0,0 @@
-use std::{
-    fs::read_to_string,
-    io::{BufRead, BufReader, Read, Write},
-};
-
-use crate::{
-    ast::Value,
-    lambda::{eval_all, eval_whnf, Environment},
-    parser::parse,
-};
-
-pub fn eval_file(file_name: &str) -> String {
-    let content = read_to_string(file_name).unwrap();
-    let values = parse(&content.to_string());
-    eval_all(&values)
-        .iter()
-        .map(|v| v.to_string())
-        .collect::<Vec<String>>()
-        .join(" ")
-}
-
-pub fn batch_eval<I: Read, O: Write>(inp: &mut I, outp: &mut O) {
-    let mut env = Environment::new();
-    let mut reader = BufReader::new(inp);
-    loop {
-        let mut input = String::new();
-        outp.flush().unwrap();
-        match reader.read_line(&mut input) {
-            Ok(0) => break,
-            Ok(_) => (),
-            Err(e) => {
-                writeln!(outp, "{}", e).unwrap();
-                break;
-            }
-        }
-        let values = parse(&input);
-        let results = values
-            .iter()
-            .map(|v| eval_whnf(v, &mut env))
-            .collect::<Vec<Value>>();
-        for result in results {
-            writeln!(outp, "{}", result).unwrap();
-            outp.flush().unwrap();
-        }
-    }
-}
-
-pub fn repl<I: Read, O: Write>(inp: &mut I, outp: &mut O) {
-    let mut env = Environment::new();
-    let mut reader = BufReader::new(inp);
-    loop {
-        let mut input = String::new();
-        write!(outp, "> ").unwrap();
-        outp.flush().unwrap();
-        match reader.read_line(&mut input) {
-            Ok(0) => break,
-            Ok(_) => (),
-            Err(e) => {
-                writeln!(outp, "{}", e).unwrap();
-                break;
-            }
-        }
-        let values = parse(&input);
-        let results = values
-            .iter()
-            .map(|v| eval_whnf(v, &mut env))
-            .collect::<Vec<Value>>();
-        for result in results {
-            writeln!(outp, "{}", result).unwrap();
-            outp.flush().unwrap();
-        }
-    }
-}
diff --git a/rust/src/lambda.rs b/rust/src/lambda.rs
deleted file mode 100644
index a73ca34..0000000
--- a/rust/src/lambda.rs
+++ /dev/null
@@ -1,292 +0,0 @@
-use proptest::{
-    arbitrary::any,
-    prelude::*,
-    strategy::{Strategy, ValueTree},
-    test_runner::TestRunner,
-};
-use rand::Rng;
-use std::collections::HashMap;
-
-use crate::ast::*;
-
-#[derive(Debug, PartialEq)]
-pub struct Environment<'a> {
-    parent: Box<Option<&'a Environment<'a>>>,
-    bindings: HashMap<String, Value>,
-}
-
-impl<'a> Environment<'a> {
-    pub fn new() -> Self {
-        Environment {
-            parent: Box::new(None),
-            bindings: HashMap::new(),
-        }
-    }
-
-    fn bind(&mut self, var: &str, value: &Value) {
-        self.bindings.insert(var.to_string(), value.clone());
-    }
-
-    fn extends(&'a self) -> Self {
-        Environment {
-            parent: Box::new(Some(self)),
-            bindings: HashMap::new(),
-        }
-    }
-
-    fn lookup(&self, var: &str) -> Option<&Value> {
-        self.bindings.get(var).or_else(|| match *self.parent {
-            Some(parent) => parent.lookup(var),
-            None => None,
-        })
-    }
-}
-
-impl<'a> Default for Environment<'a> {
-    fn default() -> Self {
-        Self::new()
-    }
-}
-
-pub fn eval_all(values: &[Value]) -> Vec<Value> {
-    let mut env = Environment::new();
-    values.iter().map(|v| eval_whnf(v, &mut env)).collect()
-}
-
-/// Reduce the given value to weak head normal form using call-by-name
-/// evaluation strategy.
-///
-/// call-by-name reduces the leftmost outermost redex first, which is
-/// not under a lambda abstraction.
-pub fn eval_whnf(arg: &Value, env: &mut Environment) -> Value {
-    match arg {
-        Value::Def(var, value) => {
-            env.bind(var, value);
-            Value::Bool(true) // TODO: return a more meaningful value?
-        }
-        Value::Let(var, value, expr) => {
-            let mut newenv = env.extends();
-            newenv.bind(var, value);
-            eval_whnf(expr, &mut newenv)
-        }
-        Value::App(l, r) => match eval_whnf(l, env) {
-            Value::Lam(v, body) => eval_whnf(&subst(&v, &body, r), env),
-            Value::Sym(var) => match env.lookup(&var) {
-                Some(val) => eval_whnf(&Value::App(Box::new(val.clone()), r.clone()), env),
-                None => arg.clone(),
-            },
-            other => Value::App(Box::new(other), r.clone()),
-        },
-        Value::Sym(var) => env.lookup(var).unwrap_or(arg).clone(),
-        other => other.clone(),
-    }
-}
-
-fn subst(var: &str, body: &Value, e: &Value) -> Value {
-    match body {
-        Value::Sym(x) if x == var => e.clone(),
-        Value::Lam(x, b) if x == var => {
-            let y = gensym();
-            let bd = subst(x, b, &Value::Sym(y.clone()));
-            Value::Lam(y, Box::new(bd))
-        }
-        Value::Lam(x, b) => Value::Lam(x.to_string(), Box::new(subst(var, b, e))),
-        Value::App(l, r) => Value::App(Box::new(subst(var, l, e)), Box::new(subst(var, r, e))),
-        other => other.clone(),
-    }
-}
-
-pub fn gensym() -> String {
-    let mut rng = rand::thread_rng();
-
-    let n1: u8 = rng.gen();
-    format!("x_{}", n1)
-}
-
-pub fn generate_expr(size: u32, runner: &mut TestRunner) -> Value {
-    match size {
-        0 | 1 => {
-            let n = any::<u16>().new_tree(runner).unwrap().current();
-            Value::Num(n.into())
-        }
-        2 => Value::Sym(ascii_identifier().new_tree(runner).unwrap().current()),
-        3 => any_sym().new_tree(runner).unwrap().current(),
-        4 => simple_app().new_tree(runner).unwrap().current(),
-        5 => nested_simple_app().new_tree(runner).unwrap().current(),
-        6 => simple_lambda().new_tree(runner).unwrap().current(),
-        7 => app_to_lambda().new_tree(runner).unwrap().current(),
-        8 => multi_app().new_tree(runner).unwrap().current(),
-        _ => any::<u32>()
-            .prop_flat_map(gen_terms)
-            .new_tree(runner)
-            .unwrap()
-            .current(),
-    }
-}
-
-pub fn generate_exprs(size: u32, runner: &mut TestRunner) -> Vec<Value> {
-    let sz = (0..size).new_tree(runner).unwrap().current();
-    (0..sz)
-        .collect::<Vec<_>>()
-        .into_iter()
-        .map(|_| generate_expr(size, runner))
-        .collect()
-}
-
-fn simple_app() -> impl Strategy<Value = Value> {
-    let leaf = prop_oneof![any_num(), any_sym()];
-    (leaf.clone(), leaf.clone()).prop_map(|(l, r)| Value::App(Box::new(l), Box::new(r)))
-}
-
-fn multi_app() -> impl Strategy<Value = Value> {
-    let leaf = prop_oneof![any_num(), any_sym()];
-    (leaf.clone(), leaf.clone()).prop_map(|(l, r)| Value::App(Box::new(l), Box::new(r)))
-}
-
-fn any_num() -> impl Strategy<Value = Value> {
-    any::<i32>().prop_map(Value::Num)
-}
-
-fn nested_simple_app() -> impl Strategy<Value = Value> {
-    let leaf = prop_oneof![any_num(), ascii_identifier().prop_map(Value::Sym)];
-    leaf.prop_recursive(4, 128, 5, move |inner| {
-        (inner.clone(), inner.clone()).prop_map(|(l, r)| Value::App(Box::new(l), Box::new(r)))
-    })
-}
-
-fn any_sym() -> impl Strategy<Value = Value> {
-    identifier().prop_map(Value::Sym)
-}
-
-fn simple_lambda() -> impl Strategy<Value = Value> {
-    // TODO: there's nothing to guarantee the variable appears in the body
-    (ascii_identifier(), nested_simple_app()).prop_map(|(v, b)| Value::Lam(v, Box::new(b)))
-}
-
-fn app_to_lambda() -> impl Strategy<Value = Value> {
-    let lam = simple_lambda();
-    let arg = prop_oneof![any_num(), any_sym(), nested_simple_app()];
-    (lam, arg).prop_map(|(l, a)| Value::App(Box::new(l), Box::new(a)))
-}
-
-/// Cantor pairing function
-/// See https://en.wikipedia.org/wiki/Pairing_function
-fn pairing(k: u32) -> (u32, u32) {
-    let a = ((((8 * (k as u64) + 1) as f64).sqrt() - 1.0) / 2.0).floor();
-    let b = (a * (a + 1.0)) / 2.0;
-    let n = (k as f64) - b;
-    (n as u32, (a - n) as u32)
-}
-
-fn gen_terms(u: u32) -> impl Strategy<Value = Value> {
-    if u % 2 != 0 {
-        let j = (u - 1) / 2;
-        if j % 2 == 0 {
-            let k = j / 2;
-            let (n, m) = pairing(k);
-            let r = (gen_terms(n), gen_terms(m))
-                .prop_map(move |(l, r)| Value::App(Box::new(l), Box::new(r)));
-            r.boxed()
-        } else {
-            let k = (j - 1) / 2;
-            let (n, m) = pairing(k);
-            let r = gen_terms(m).prop_map(move |v| Value::Lam(format!("x_{}", n), Box::new(v)));
-            r.boxed()
-        }
-    } else {
-        let j = u / 2;
-        Just(Value::Sym(format!("x_{}", j))).boxed()
-    }
-}
-
-#[cfg(test)]
-mod lambda_test {
-    use crate::parser::parse;
-
-    use super::{eval_all, eval_whnf, Environment, Value};
-
-    fn parse1(string: &str) -> Value {
-        parse(string).pop().unwrap()
-    }
-
-    fn eval1(value: &Value) -> Value {
-        eval_whnf(value, &mut Environment::new())
-    }
-
-    #[test]
-    fn evaluating_a_non_reducible_value_yields_itself() {
-        let value = parse1("(foo 12)");
-        assert_eq!(value, eval1(&value));
-    }
-
-    #[test]
-    fn evaluating_application_on_an_abstraction_reduces_it() {
-        let value = parse1("((lam x x) 12)");
-        assert_eq!(Value::Num(12), eval1(&value));
-    }
-
-    #[test]
-    fn substitution_occurs_within_abstraction_body() {
-        let value = parse1("(((lam x (lam y x)) 13) 12)");
-        assert_eq!(Value::Num(13), eval1(&value));
-    }
-
-    #[test]
-    fn substitution_occurs_within_application_body() {
-        let value = parse1("(((lam x (lam y (y x))) 13) 12)");
-        assert_eq!(
-            Value::App(Box::new(Value::Num(12)), Box::new(Value::Num(13))),
-            eval1(&value)
-        );
-    }
-
-    #[test]
-    fn substitution_does_not_capture_free_variables() {
-        let value = parse1("(((lam x (lam x x)) 13) 12)");
-        assert_eq!(Value::Num(12), eval1(&value));
-    }
-
-    #[test]
-    fn interpretation_applies_to_both_sides_of_application() {
-        let value = parse1("((lam x x) ((lam x x) 12))");
-        assert_eq!(Value::Num(12), eval1(&value));
-    }
-
-    #[test]
-    fn reduction_is_applied_until_normal_form_is_reached() {
-        let value = parse1("((((lam y (lam x (lam y (x y)))) 13) (lam x x)) 11)");
-        assert_eq!(Value::Num(11), eval1(&value));
-    }
-
-    #[test]
-    fn reduction_always_select_leftmost_outermost_redex() {
-        // this should not terminate if we evaluate the rightmost redex first, eg.
-        // applicative order reduction
-        let value = parse1("((lam x 1) ((lam x (x x)) (lam x (x x))))");
-        assert_eq!(Value::Num(1), eval1(&value));
-    }
-
-    #[test]
-    fn defined_symbols_are_evaluated_to_their_definition() {
-        let values = parse("(def foo 12)  foo");
-        assert_eq!(vec![Value::Bool(true), Value::Num(12)], eval_all(&values));
-    }
-
-    #[test]
-    fn let_expressions_bind_symbol_to_expression_in_environment() {
-        let values = parse("(let (foo (lam x x))  (foo 12))");
-        assert_eq!(vec![Value::Num(12)], eval_all(&values));
-    }
-
-    #[test]
-    fn let_expressions_introduce_new_scope_for_bindings() {
-        let values = parse("(let (foo (lam x x)) ((let (foo foo) foo) 13))");
-        assert_eq!(vec![Value::Num(13)], eval_all(&values));
-    }
-
-    #[test]
-    fn bound_symbol_in_higher_scope_are_resolved() {
-        let values = parse("(let (id (lam x x)) (let (foo 12) (id foo)))");
-        assert_eq!(vec![Value::Num(12)], eval_all(&values));
-    }
-}
diff --git a/rust/src/lib.rs b/rust/src/lib.rs
deleted file mode 100644
index a8cf18e..0000000
--- a/rust/src/lib.rs
+++ /dev/null
@@ -1,4 +0,0 @@
-pub mod ast;
-pub mod io;
-pub mod lambda;
-pub mod parser;
diff --git a/rust/src/main.rs b/rust/src/main.rs
deleted file mode 100644
index 8d52c46..0000000
--- a/rust/src/main.rs
+++ /dev/null
@@ -1,18 +0,0 @@
-use std::{
-    env::args,
-    io::{stdin, stdout, IsTerminal},
-};
-
-use lambda::io::{batch_eval, eval_file, repl};
-
-fn main() {
-    if args().count() > 1 {
-        for file in args().skip(1) {
-            println!("{}", eval_file(&file));
-        }
-    } else if stdin().is_terminal() {
-        repl(&mut stdin(), &mut stdout());
-    } else {
-        batch_eval(&mut stdin(), &mut stdout());
-    }
-}
diff --git a/rust/src/parser.rs b/rust/src/parser.rs
deleted file mode 100644
index 52aad5a..0000000
--- a/rust/src/parser.rs
+++ /dev/null
@@ -1,392 +0,0 @@
-use crate::ast::*;
-
-#[derive(Debug, PartialEq)]
-enum Token {
-    LParen,
-    RParen,
-    Lambda,
-    Word(String),
-    Define,
-    Let,
-}
-
-#[derive(Debug)]
-struct Parser {
-    tokens: Vec<Token>,
-    index: usize,
-}
-
-impl Parser {
-    fn expect(&mut self, token: Token) -> Result<(), String> {
-        if self.tokens.get(self.index) == Some(&token) {
-            Ok(())
-        } else {
-            Err(format!(
-                "Expected {:?}, got {:?}",
-                token,
-                self.tokens.get(self.index)
-            ))
-        }
-        .map(|_| {
-            self.next();
-        })
-    }
-
-    fn expect_symbol(&mut self) -> Result<String, String> {
-        if let Token::Word(s) = self.tokens.get(self.index).ok_or("Expected a symbol")? {
-            Ok(s.clone())
-        } else {
-            Err("Expected a symbol".to_string())
-        }
-        .map(|s| {
-            self.next();
-            s
-        })
-    }
-
-    fn next(&mut self) {
-        self.index += 1;
-    }
-
-    fn backtrack(&mut self) {
-        self.index -= 1;
-    }
-}
-
-pub fn parse(arg: &str) -> Vec<Value> {
-    parse_total(arg)
-        .map_err(|e| panic!("Syntax error: {}", e))
-        .unwrap()
-}
-
-pub fn parse_total(arg: &str) -> Result<Vec<Value>, String> {
-    let tokens = tokenize(arg);
-    let mut parser = Parser { tokens, index: 0 };
-    let mut result = Vec::new();
-    while parser.index < parser.tokens.len() {
-        let expr = parse_toplevel(&mut parser)?;
-        result.push(expr);
-    }
-    Ok(result)
-}
-
-fn parse_toplevel(parser: &mut Parser) -> Result<Value, String> {
-    parse_definition(parser).or_else(|_| parse_expression(parser))
-}
-
-fn parse_definition(parser: &mut Parser) -> Result<Value, String> {
-    parser.expect(Token::LParen)?;
-    parser.expect(Token::Define).map_err(|e| {
-        parser.backtrack();
-        e.to_string()
-    })?;
-    let var = parse_variable(parser)?;
-    let body = parse_expression(parser)?;
-    parser.expect(Token::RParen)?;
-    Ok(Value::Def(var, Box::new(body)))
-}
-
-fn parse_expression(parser: &mut Parser) -> Result<Value, String> {
-    parse_value(parser)
-        .or_else(|_| parse_abstraction(parser))
-        .or_else(|_| parse_let(parser))
-        .or_else(|_| parse_application(parser))
-}
-
-fn parse_abstraction(parser: &mut Parser) -> Result<Value, String> {
-    parser.expect(Token::LParen)?;
-    parser.expect(Token::Lambda).map_err(|e| {
-        parser.backtrack();
-        e.to_string()
-    })?;
-    let vars = parse_variables(parser)?;
-    let body = parse_expression(parser)?;
-    parser.expect(Token::RParen)?;
-    let result = vars
-        .iter()
-        .rev()
-        .fold(body, |acc, var| Value::Lam(var.clone(), Box::new(acc)));
-    Ok(result)
-}
-
-fn parse_variables(parser: &mut Parser) -> Result<Vec<String>, String> {
-    parse_variable(parser)
-        .map(|s| vec![s])
-        .or_else(|_| parse_variables_list(parser))
-}
-
-fn parse_variables_list(parser: &mut Parser) -> Result<Vec<String>, String> {
-    let mut vars = Vec::new();
-    parser.expect(Token::LParen)?;
-    while let Ok(var) = parse_variable(parser) {
-        vars.push(var);
-    }
-    parser.expect(Token::RParen)?;
-    Ok(vars)
-}
-
-fn parse_variable(parser: &mut Parser) -> Result<String, String> {
-    let var = parser.expect_symbol()?;
-    Ok(var)
-}
-
-fn parse_let(parser: &mut Parser) -> Result<Value, String> {
-    parser.expect(Token::LParen)?;
-    parser.expect(Token::Let).map_err(|e| {
-        parser.backtrack();
-        e.to_string()
-    })?;
-    parser.expect(Token::LParen)?;
-    let var = parse_variable(parser)?;
-    let body = parse_expression(parser)?;
-    parser.expect(Token::RParen)?;
-    let expr = parse_expression(parser)?;
-    parser.expect(Token::RParen)?;
-    Ok(Value::Let(var, Box::new(body), Box::new(expr)))
-}
-
-fn parse_application(parser: &mut Parser) -> Result<Value, String> {
-    parser.expect(Token::LParen)?;
-    let init = parse_expression(parser)?;
-    let mut exprs = Vec::new();
-    while let Ok(expr) = parse_expression(parser) {
-        exprs.push(expr);
-    }
-    if exprs.is_empty() {
-        return Err("Application needs two values".to_string());
-    }
-    parser.expect(Token::RParen)?;
-    let app: Value = exprs.iter().fold(init, |acc, expr| {
-        Value::App(Box::new(acc.clone()), Box::new(expr.clone()))
-    });
-    Ok(app.to_owned())
-}
-
-fn parse_value(parser: &mut Parser) -> Result<Value, String> {
-    let token = parser.tokens.get(parser.index).ok_or("Expected a value")?;
-    let val = parse_number(token)
-        .or_else(|_| parse_bool(token))
-        .or_else(|_| parse_symbol(token))?;
-    parser.next();
-    Ok(val)
-}
-
-fn tokenize(arg: &str) -> Vec<Token> {
-    let mut result = Vec::new();
-    let mut word = String::new();
-
-    for c in arg.chars() {
-        match c {
-            '(' => {
-                terminate(&mut result, &mut word);
-                result.push(Token::LParen)
-            }
-            ')' => {
-                terminate(&mut result, &mut word);
-                result.push(Token::RParen)
-            }
-            c if c.is_whitespace() => terminate(&mut result, &mut word),
-            c => word.push(c),
-        }
-    }
-    terminate(&mut result, &mut word);
-    result
-}
-
-fn terminate(result: &mut Vec<Token>, word: &mut String) {
-    if !word.is_empty() {
-        let w = word.clone();
-        if w == "lam" {
-            result.push(Token::Lambda);
-        } else if w == "def" {
-            result.push(Token::Define);
-        } else if w == "let" {
-            result.push(Token::Let);
-        } else {
-            result.push(Token::Word(w));
-        }
-        word.clear();
-    }
-}
-
-fn parse_symbol(token: &Token) -> Result<Value, String> {
-    match token {
-        Token::Word(s) => Ok(Value::Sym(s.clone())),
-        _ => Err(format!("Expected a symbol, got {:?}", token)),
-    }
-}
-
-fn parse_bool(token: &Token) -> Result<Value, String> {
-    match token {
-        Token::Word(s) => s
-            .parse::<bool>()
-            .map(Value::Bool)
-            .map_err(|e| e.to_string()),
-        _ => Err("Expected a boolean".to_string()),
-    }
-}
-
-fn parse_number(token: &Token) -> Result<Value, String> {
-    match token {
-        Token::Word(s) => s.parse::<i32>().map(Value::Num).map_err(|e| e.to_string()),
-        _ => Err("Expected an integer".to_string()),
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::parse_total;
-
-    use super::Token::*;
-    use super::Value;
-    use super::Value::*;
-    use super::{parse, tokenize};
-    use proptest::prelude::*;
-
-    proptest! {
-            #[test]
-            fn parse_integer_as_number(i in -1000i32..1000) {
-                let result = parse(&i.to_string());
-                assert_eq!(vec![Num(i)], result);
-            }
-
-    }
-
-    #[test]
-    fn parse_truth_values_as_booleans() {
-        assert_eq!(vec![Bool(true)], parse("true"));
-        assert_eq!(vec![Bool(false)], parse("false"));
-    }
-
-    #[test]
-    fn parse_identifiers_values_as_symbols() {
-        assert_eq!(vec![Sym("foo".to_string())], parse("foo"));
-    }
-
-    #[test]
-    fn ignores_whitespace() {
-        assert_eq!(vec![Sym("foo".to_string())], parse("  foo  \n\r"));
-        assert_eq!(vec![Num(-42)], parse("\n-42"));
-    }
-
-    #[test]
-    fn tokenize_several_values() {
-        assert_eq!(
-            vec![
-                Word("42".to_string()),
-                Word("foo".to_string()),
-                Word("true".to_string())
-            ],
-            tokenize("42 foo    \ntrue  ")
-        );
-    }
-
-    #[test]
-    fn tokenize_string_with_parens() {
-        assert_eq!(
-            vec![
-                LParen,
-                LParen,
-                RParen,
-                Word("42".to_string()),
-                RParen,
-                Word("true".to_string()),
-                LParen,
-            ],
-            tokenize("(   \r() 42)  \ntrue(  ")
-        );
-    }
-
-    #[test]
-    fn tokenize_lambda_symbol() {
-        assert_eq!(vec![Lambda, LParen,], tokenize("lam  ("));
-    }
-
-    #[test]
-    fn parse_application_of_two_values() {
-        assert_eq!(
-            vec![App(Box::new(Sym("foo".to_string())), Box::new(Num(42)))],
-            parse("(foo 42)")
-        );
-    }
-
-    #[test]
-    fn reject_application_of_single_value() {
-        assert_eq!(
-            Err("Application needs two values".to_string()),
-            parse_total("(foo )")
-        );
-    }
-
-    #[test]
-    fn desugar_application_of_more_than_two_values() {
-        assert_eq!(
-            vec![App(
-                Box::new(App(
-                    Box::new(App(Box::new(Sym("foo".to_string())), Box::new(Num(42)))),
-                    Box::new(Bool(true))
-                )),
-                Box::new(Sym("f".to_string()))
-            )],
-            parse("(foo 42 true f)")
-        );
-    }
-
-    #[test]
-    fn parse_abstraction() {
-        assert_eq!(
-            vec![Lam(
-                "x".to_string(),
-                Box::new(App(
-                    Box::new(Sym("x".to_string())),
-                    Box::new(Sym("x".to_string()))
-                ))
-            )],
-            parse("(lam x (x x))")
-        );
-    }
-
-    #[test]
-    fn desugar_abstraction_with_several_variables_into_nested_lambdas() {
-        assert_eq!(
-            vec![Lam(
-                "x".to_string(),
-                Box::new(Lam("y".to_string(), Box::new(Sym("y".to_string()))))
-            )],
-            parse("(lam (x y) y)")
-        );
-    }
-
-    #[test]
-    fn parse_definition() {
-        assert_eq!(
-            vec![Def("x".to_string(), Box::new(Num(12)))],
-            parse("(def x 12)")
-        );
-    }
-
-    #[test]
-    fn parse_multiple_values() {
-        assert_eq!(vec![Sym("foo".to_string()), Num(42)], parse("foo 42"));
-    }
-
-    #[test]
-    fn parse_let_expressions() {
-        assert_eq!(
-            vec![Value::Let(
-                "x".to_string(),
-                Box::new(Num(12)),
-                Box::new(Sym("x".to_string()))
-            )],
-            parse("(let (x 12) x)")
-        );
-    }
-
-    proptest! {
-            #[test]
-            fn parse_is_inverse_to_display(values in any::<Vec<Value>>()) {
-                let result : Vec<String> = values.iter().map(|v:&Value| v.to_string()).collect();
-                assert_eq!(values, result.iter().flat_map(|s| parse(s)).collect::<Vec<Value>>());
-            }
-    }
-}
diff --git a/rust/src/tester.rs b/rust/src/tester.rs
deleted file mode 100644
index eb66d4e..0000000
--- a/rust/src/tester.rs
+++ /dev/null
@@ -1,100 +0,0 @@
-use serde::{Deserialize, Serialize};
-use std::{
-    fs::{self, read_to_string, File},
-    path::PathBuf,
-    process::{Command, Stdio},
-    time::Instant,
-};
-
-pub fn main() {
-    let mut args: Vec<String> = std::env::args().collect();
-    // name of the process to run
-    let proc = args.remove(1);
-    if args.len() > 1 {
-        let run = traverse(&args)
-            .and_then(|paths| run_test(&proc, &paths))
-            .expect("Failed to traverse directory");
-        println!("{}", serde_json::to_string_pretty(&run).unwrap());
-    } else {
-        println!(
-            r#"Usage: tester [options] <directory>+
-
-Options:
-    -p, --process   The process to run. If the given process is not a
-                    an absolute path, it will be resolved against the
-                    PATH environment variable.
-    -j, --json      Output the results in JSON format (default: false)
-    -h, --help      Display this help message
-    -v, --version   Display the version of the tester
-"#
-        );
-    }
-}
-
-fn traverse(args: &[String]) -> Result<Vec<PathBuf>, String> {
-    let mut files: Vec<PathBuf> = Vec::new();
-    for arg in args.iter().skip(1) {
-        let entries = fs::read_dir(arg).map_err(|e| e.to_string())?;
-        for entry in entries {
-            let dir = entry.map_err(|e| e.to_string())?;
-            let f = dir.metadata().map_err(|e| e.to_string())?;
-            if f.is_dir() {
-                files.push(dir.path());
-            }
-        }
-    }
-    Ok(files)
-}
-
-#[derive(Debug, Serialize, Deserialize)]
-pub enum TestResult {
-    TestSucceeded,
-    TestFailed(String, String),
-}
-
-#[derive(Debug, Serialize, Deserialize)]
-pub struct TestRun {
-    file: String,
-    test_result: TestResult,
-    duration: u128,
-}
-
-fn run_test(proc: &str, files: &Vec<PathBuf>) -> Result<Vec<TestRun>, String> {
-    let mut result = Vec::new();
-    for file in files {
-        let mut inp = file.clone();
-        let mut outp = file.clone();
-        inp.push("input");
-        outp.push("output");
-        let (test_result, duration) = run_test_case(proc, &inp, &outp)?;
-        result.push(TestRun {
-            file: inp.as_path().to_str().unwrap().to_string(),
-            test_result,
-            duration,
-        });
-    }
-    Ok(result)
-}
-
-fn run_test_case(
-    proc: &str,
-    inp: &std::path::PathBuf,
-    outp: &std::path::PathBuf,
-) -> Result<(TestResult, u128), String> {
-    let input = File::open(inp).map_err(|e| e.to_string())?;
-    let expected = read_to_string(outp).map_err(|e| e.to_string())?;
-    let start = Instant::now();
-
-    let actual = Command::new(proc)
-        .stdin(Stdio::from(input))
-        .output()
-        .map_err(|e| e.to_string())?;
-
-    let duration = (Instant::now() - start).as_millis();
-    if expected.as_bytes() == actual.stdout {
-        Ok((TestResult::TestSucceeded, duration))
-    } else {
-        let actual_string = String::from_utf8(actual.stdout).map_err(|e| e.to_string())?;
-        Ok((TestResult::TestFailed(expected, actual_string), duration))
-    }
-}
diff --git a/rust/src/web.rs b/rust/src/web.rs
deleted file mode 100644
index 3f8f056..0000000
--- a/rust/src/web.rs
+++ /dev/null
@@ -1,899 +0,0 @@
-use actix_web::{get, middleware::Logger, post, web, App, HttpResponse, HttpServer, Responder};
-use chrono::{DateTime, Utc};
-use clap::Parser;
-use handlebars::{DirectorySourceOptions, Handlebars};
-use log::info;
-use proptest::test_runner::{Config, RngAlgorithm, TestRng, TestRunner};
-use rand::Rng;
-use serde::{Deserialize, Serialize};
-use std::sync::Mutex;
-use std::time::Duration;
-use std::{collections::HashMap, sync::Arc};
-use tokio::task::{self, JoinHandle};
-use uuid::Uuid;
-
-use lambda::lambda::{eval_all, eval_whnf, generate_expr, generate_exprs, gensym, Environment};
-use lambda::parser::{parse, parse_total};
-
-#[derive(Debug, PartialEq, Serialize, Deserialize, Clone)]
-struct Registration {
-    url: String,
-    name: String,
-}
-
-#[derive(Debug, Serialize, Deserialize, Clone)]
-struct ClientData {
-    name: String,
-    grade: u8,
-    last_query: DateTime<Utc>,
-    success: bool,
-}
-
-impl ClientData {
-    fn from(client: &Client) -> Self {
-        ClientData {
-            name: client.name.clone(),
-            grade: client.grade,
-            last_query: client
-                .results
-                .last()
-                .map_or(chrono::offset::Utc::now(), |q| q.timestamp),
-            success: client
-                .results
-                .last()
-                .map_or(false, |q| matches!(q.result, TestResult::TestSucceeded)),
-        }
-    }
-}
-
-#[derive(Debug, Serialize, Deserialize, Clone)]
-struct Leaderboard {
-    clients: Vec<ClientData>,
-}
-
-trait AppState: Send + Sync {
-    fn register(&mut self, registration: &Registration) -> RegistrationResult;
-    fn unregister(&mut self, url: &String);
-}
-
-#[derive(Debug, PartialEq, Serialize, Deserialize, Clone)]
-enum RegistrationResult {
-    RegistrationSuccess { id: String, url: String },
-    UrlAlreadyRegistered { url: String },
-}
-
-#[derive(Debug, Clone)]
-struct Client {
-    id: Uuid,
-    name: String,
-    url: String,
-    grade: u8,
-    runner: TestRunner,
-    results: Vec<Test>,
-    delay: std::time::Duration,
-}
-
-#[derive(Debug, PartialEq, Serialize, Deserialize, Clone)]
-struct Test {
-    timestamp: DateTime<Utc>,
-    result: TestResult,
-}
-
-#[derive(Debug, PartialEq, Serialize, Deserialize, Clone)]
-enum TestResult {
-    TestFailed(String),
-    ErrorSendingTest(String),
-    TestSucceeded,
-}
-
-impl Client {
-    fn new(url: String, name: String, delay: Duration) -> Self {
-        let id = Uuid::new_v4();
-        let runner = TestRunner::new_with_rng(
-            Config::default(),
-            TestRng::from_seed(RngAlgorithm::XorShift, &id.to_bytes_le()),
-        );
-        Self {
-            id,
-            url,
-            name,
-            grade: 1,
-            runner,
-            results: Vec::new(),
-            delay,
-        }
-    }
-
-    fn time_to_next_test(&self) -> Duration {
-        self.delay
-    }
-
-    fn generate_expr(&mut self) -> (String, String) {
-        if self.grade >= 10 {
-            self.generate_exprs()
-        } else {
-            let input = generate_expr(self.grade.into(), &mut self.runner);
-            let expected = eval_whnf(&input, &mut Environment::new());
-            (input.to_string(), expected.to_string())
-        }
-    }
-
-    fn generate_exprs(&mut self) -> (String, String) {
-        let exprs = generate_exprs(self.grade.into(), &mut self.runner);
-        let input = exprs
-            .iter()
-            .map(|v| format!("{}", v))
-            .collect::<Vec<_>>()
-            .join("\n");
-        let expected = eval_all(&exprs);
-        (
-            input,
-            expected
-                .iter()
-                .map(|v| format!("{}", v))
-                .collect::<Vec<_>>()
-                .join("\n"),
-        )
-    }
-
-    /// Applies a `Test` to update client's state
-    fn apply(&mut self, test: &Test) {
-        match test.result {
-            TestResult::TestSucceeded => {
-                self.grade = self.grade.saturating_add(1);
-                self.delay = Duration::from_secs_f64(self.delay.as_secs_f64() * 0.8);
-                if self.delay.as_millis() < 500 {
-                    self.delay = Duration::from_millis(500);
-                }
-            }
-            TestResult::TestFailed(_) => {
-                self.delay = Duration::from_secs_f64(self.delay.as_secs_f64() * 1.2);
-                if self.delay.as_secs() > 30 {
-                    self.delay = Duration::from_secs(30);
-                }
-            }
-            _ => (),
-        }
-        self.results.push(test.clone());
-    }
-
-    fn check_result(&self, expected: &String, response: &Result<String, TestResult>) -> Test {
-        let result = match response {
-            Ok(expr) => {
-                let vals = parse(expr);
-                let actual = eval_all(&vals)
-                    .iter()
-                    .map(|v| format!("{}", v))
-                    .collect::<Vec<_>>()
-                    .join("\n");
-                if actual == *expected {
-                    TestResult::TestSucceeded
-                } else {
-                    TestResult::TestFailed(actual)
-                }
-            }
-            Err(res) => res.clone(),
-        };
-        Test {
-            result,
-            timestamp: chrono::offset::Utc::now(),
-        }
-    }
-}
-
-#[derive(Debug)]
-struct State {
-    base_duration: Duration,
-    clients: HashMap<String, (Arc<Mutex<Client>>, JoinHandle<()>)>,
-}
-
-impl State {
-    fn new() -> Self {
-        State::with_duration(Duration::from_secs(10))
-    }
-
-    fn with_duration(base_duration: Duration) -> Self {
-        Self {
-            base_duration,
-            clients: HashMap::new(),
-        }
-    }
-
-    fn client_events(&self, url: &String) -> usize {
-        let client = self.clients.get(url).unwrap().0.lock().unwrap();
-        client.results.len()
-    }
-}
-
-impl AppState for State {
-    fn register(&mut self, registration: &Registration) -> RegistrationResult {
-        if self.clients.contains_key(&registration.url) {
-            RegistrationResult::UrlAlreadyRegistered {
-                url: registration.url.clone(),
-            }
-        } else {
-            let client = Client::new(
-                registration.url.clone(),
-                registration.name.clone(),
-                self.base_duration,
-            );
-            let id = client.id.to_string();
-            let client_ref = Arc::new(Mutex::new(client));
-            // let it run in the background
-            // FIXME: should find a way to handle graceful termination
-            let client_handle = task::spawn(send_tests(client_ref.clone()));
-
-            self.clients.insert(
-                registration.url.clone(),
-                (client_ref.clone(), client_handle),
-            );
-
-            RegistrationResult::RegistrationSuccess {
-                id,
-                url: registration.url.clone(),
-            }
-        }
-    }
-
-    fn unregister(&mut self, url: &String) {
-        let (_, handle) = self.clients.get(url).unwrap();
-        handle.abort()
-    }
-}
-
-#[post("/register")]
-async fn register(
-    app_state: web::Data<Arc<Mutex<State>>>,
-    registration: web::Json<Registration>,
-) -> impl Responder {
-    let result = app_state.lock().unwrap().register(&registration);
-    match result {
-        RegistrationResult::RegistrationSuccess { .. } => HttpResponse::Ok().json(result),
-        RegistrationResult::UrlAlreadyRegistered { .. } => HttpResponse::BadRequest().json(result),
-    }
-}
-
-#[post("/eval")]
-async fn eval(input: String) -> impl Responder {
-    let exprs = parse_total(&input);
-    match exprs {
-        Ok(exprs) => {
-            let mut rng = rand::thread_rng();
-            if rng.gen_range(0..10) <= 2 {
-                return HttpResponse::Ok().body(gensym());
-            }
-            let output = eval_all(&exprs)
-                .iter()
-                .map(|v| format!("{}", v))
-                .collect::<Vec<_>>()
-                .join("\n");
-            HttpResponse::Ok().body(output.to_string())
-        }
-        Err(e) => HttpResponse::BadRequest().body(e.to_string()),
-    }
-}
-
-#[get("/leaderboard")]
-async fn leaderboard(
-    app_state: web::Data<Arc<Mutex<State>>>,
-    hb: web::Data<Handlebars<'_>>,
-) -> impl Responder {
-    let clients = &app_state.lock().unwrap().clients;
-    let mut client_data = vec![];
-    for client in clients.values() {
-        let client = client.0.lock().unwrap();
-        client_data.push(ClientData::from(&client));
-    }
-    client_data.sort_by(|a, b| b.grade.cmp(&a.grade));
-
-    let body = hb
-        .render(
-            "leaderboard",
-            &Leaderboard {
-                clients: client_data,
-            },
-        )
-        .unwrap();
-
-    web::Html::new(body)
-}
-
-#[derive(Parser, Debug)]
-struct Options {
-    /// The port to listen on
-    /// Defaults to 8080
-    #[arg(short, long, default_value_t = 8080)]
-    port: u16,
-    /// The host to bind the server to
-    /// Defaults to 127.0.0.1
-    #[arg(long, default_value = "127.0.0.1")]
-    host: String,
-}
-
-#[tokio::main]
-async fn main() -> std::io::Result<()> {
-    let options = Options::parse();
-    let app_state = Arc::new(Mutex::new(State::new()));
-
-    env_logger::init();
-    // Handlebars uses a repository for the compiled templates. This object must be
-    // shared between the application threads, and is therefore passed to the
-    // Application Builder as an atomic reference-counted pointer.
-    let mut handlebars = Handlebars::new();
-    handlebars
-        .register_templates_directory(
-            "./templates",
-            DirectorySourceOptions {
-                tpl_extension: ".html".to_owned(),
-                hidden: false,
-                temporary: false,
-            },
-        )
-        .unwrap();
-
-    HttpServer::new(move || {
-        App::new()
-            .wrap(Logger::default())
-            .app_data(web::Data::new(app_state.clone()))
-            .app_data(web::Data::new(handlebars.clone()))
-            .service(register)
-            .service(eval)
-            .service(leaderboard)
-    })
-    .bind((options.host, options.port))?
-    .run()
-    .await
-}
-
-fn get_test(client_m: &Mutex<Client>) -> (String, String, String) {
-    let mut client = client_m.lock().unwrap();
-    let (input, expected) = client.generate_expr();
-    (input, client.url.clone(), expected)
-}
-
-async fn send_tests(client_m: Arc<Mutex<Client>>) {
-    loop {
-        let sleep = sleep_time(&client_m);
-        tokio::time::sleep(sleep).await;
-        {
-            let (input, url, expected) = get_test(&client_m);
-
-            let response = send_test(&input, &url, sleep).await;
-
-            apply_result(&client_m, expected, response);
-        }
-    }
-}
-
-fn apply_result(client_m: &Mutex<Client>, expected: String, response: Result<String, TestResult>) {
-    let mut client = client_m.lock().unwrap();
-    let test = client.check_result(&expected, &response);
-    client.apply(&test);
-}
-
-fn sleep_time(client_m: &Arc<Mutex<Client>>) -> Duration {
-    client_m.lock().unwrap().time_to_next_test()
-}
-
-async fn send_test(input: &String, url: &String, timeout: Duration) -> Result<String, TestResult> {
-    info!("Sending {} to {}", input, url);
-    let body = input.clone();
-    let response = reqwest::Client::new()
-        .post(url)
-        .timeout(timeout)
-        .header("content-type", "text/plain")
-        .body(body)
-        .send()
-        .await;
-    match response {
-        Ok(response) => {
-            let body = response.text().await.unwrap();
-            info!("Response from {}: {}", url, body);
-            Ok(body)
-        }
-        Err(e) => {
-            info!("Error sending test: {}", e);
-            Err(TestResult::ErrorSendingTest(e.to_string()))
-        }
-    }
-}
-
-#[cfg(test)]
-mod app_tests {
-    use std::str::from_utf8;
-    use std::sync::Arc;
-
-    use actix_web::http::header::TryIntoHeaderValue;
-    use actix_web::{body, http::header::ContentType, middleware::Logger, test, App};
-    use lambda::ast::Value;
-
-    use super::*;
-
-    #[actix_web::test]
-    async fn post_registration_returns_success_with_unique_id() {
-        let state = Arc::new(Mutex::new(State::new()));
-        // FIXME should only be called once, move to setup
-        env_logger::init();
-
-        let app = test::init_service(
-            App::new()
-                .wrap(Logger::default())
-                .app_data(web::Data::new(state))
-                .service(register),
-        )
-        .await;
-        let url = "http://192.168.1.1".to_string();
-        let req = test::TestRequest::post()
-            .uri("/register")
-            .set_json(Registration {
-                url: url.clone(),
-                name: "foo".to_string(),
-            })
-            .insert_header(ContentType::json())
-            .to_request();
-
-        let resp = test::call_service(&app, req).await;
-
-        assert!(resp.status().is_success());
-
-        let body = resp.into_body();
-        let bytes = body::to_bytes(body).await;
-        match serde_json::from_slice::<RegistrationResult>(bytes.as_ref().unwrap()).unwrap() {
-            RegistrationResult::RegistrationSuccess { id: _, url: url1 } => assert_eq!(url1, url),
-            _ => panic!("Expected RegistrationSuccess, got {:?}", bytes.unwrap()),
-        };
-    }
-
-    #[actix_web::test]
-    async fn post_registration_returns_400_when_register_fails() {
-        let state = Arc::new(Mutex::new(State::new()));
-
-        let app = test::init_service(
-            App::new()
-                .wrap(Logger::default())
-                .app_data(web::Data::new(state.clone()))
-                .service(register),
-        )
-        .await;
-        let url = "http://192.168.1.1".to_string();
-        let registration = Registration {
-            url: url.clone(),
-            name: "foo".to_string(),
-        };
-
-        state.lock().unwrap().register(&registration);
-
-        let req = test::TestRequest::post()
-            .uri("/register")
-            .set_json(registration)
-            .insert_header(ContentType::json())
-            .to_request();
-
-        let resp = test::call_service(&app, req).await;
-
-        assert!(resp.status().is_client_error());
-        assert_eq!(
-            ContentType::json().try_into_value().unwrap(),
-            resp.headers().get("content-type").unwrap()
-        );
-    }
-
-    #[actix_web::test]
-    async fn post_expression_returns_evaluation() {
-        let app = test::init_service(App::new().wrap(Logger::default()).service(eval)).await;
-
-        let req = test::TestRequest::post()
-            .uri("/eval")
-            .set_payload("((lam (x y) x) 1 2)")
-            .insert_header(ContentType::plaintext())
-            .to_request();
-
-        let resp = test::call_service(&app, req).await;
-
-        assert!(resp.status().is_success());
-
-        let body = resp.into_body();
-        let bytes = body::to_bytes(body).await.unwrap();
-        assert_eq!(bytes, "1".to_string().into_bytes());
-    }
-
-    #[actix_web::test]
-    async fn post_expression_returns_multiple_evaluations() {
-        let app = test::init_service(App::new().wrap(Logger::default()).service(eval)).await;
-
-        let req = test::TestRequest::post()
-            .uri("/eval")
-            .set_payload("((lam (x y) x) 1 2)\n42")
-            .insert_header(ContentType::plaintext())
-            .to_request();
-
-        let resp = test::call_service(&app, req).await;
-
-        assert!(resp.status().is_success());
-
-        let body = resp.into_body();
-        let bytes = body::to_bytes(body).await.unwrap();
-        assert_eq!("1\n42".to_string().into_bytes(), bytes);
-    }
-
-    #[actix_web::test]
-    async fn get_leaderboard_returns_html_page_listing_clients_state() {
-        let app_state = Arc::new(Mutex::new(State::new()));
-        app_state.lock().unwrap().register(&Registration {
-            url: "http://1.2.3.4".to_string(),
-            name: "client1".to_string(),
-        });
-
-        let mut handlebars = Handlebars::new();
-        handlebars
-            .register_templates_directory(
-                "./templates",
-                DirectorySourceOptions {
-                    tpl_extension: ".html".to_owned(),
-                    hidden: false,
-                    temporary: false,
-                },
-            )
-            .unwrap();
-
-        let app = test::init_service(
-            App::new()
-                .wrap(Logger::default())
-                .app_data(web::Data::new(app_state.clone()))
-                .app_data(web::Data::new(handlebars.clone()))
-                .service(leaderboard),
-        )
-        .await;
-
-        let req = test::TestRequest::get().uri("/leaderboard").to_request();
-
-        let resp = test::call_service(&app, req).await;
-
-        assert!(resp.status().is_success());
-
-        let bytes = body::to_bytes(resp.into_body()).await.unwrap();
-        assert!(from_utf8(&bytes).unwrap().contains("client1"));
-    }
-
-    #[test]
-    async fn app_does_not_register_same_url_twice() {
-        let mut app_state = State::new();
-        let registration = Registration {
-            name: "foo".to_string(),
-            url: "http://1.2.3.4".to_string(),
-        };
-
-        app_state.register(&registration);
-        let result = app_state.register(&registration);
-
-        assert_eq!(
-            RegistrationResult::UrlAlreadyRegistered {
-                url: "http://1.2.3.4".to_string()
-            },
-            result
-        );
-    }
-
-    #[test]
-    async fn unregistering_registered_client_stops_tester_thread_from_sending_tests() {
-        let mut app_state = State::with_duration(Duration::from_millis(100));
-        let registration = Registration {
-            name: "foo".to_string(),
-            url: "http://1.2.3.4".to_string(),
-        };
-
-        let reg = app_state.register(&registration);
-        assert!(matches!(
-            reg,
-            RegistrationResult::RegistrationSuccess { .. }
-        ));
-
-        tokio::time::sleep(Duration::from_millis(500)).await;
-
-        app_state.unregister(&registration.url);
-
-        let grade_before = app_state.client_events(&registration.url);
-        tokio::time::sleep(Duration::from_millis(500)).await;
-        let grade_after = app_state.client_events(&registration.url);
-
-        assert_eq!(grade_before, grade_after);
-    }
-
-    fn client() -> Client {
-        Client::new(
-            "http://1.2.3.4".to_string(),
-            "foo".to_string(),
-            Duration::from_secs(10),
-        )
-    }
-
-    #[test]
-    async fn client_generates_constant_at_level_1() {
-        let mut client = client();
-
-        let (input, _) = client.generate_expr();
-
-        match parse(&input)[..] {
-            [Value::Num(_)] => (),
-            _ => panic!("Expected constant 3"),
-        }
-    }
-
-    #[test]
-    async fn client_generates_different_inputs_on_each_call() {
-        let mut client = client();
-
-        let (input1, _) = client.generate_expr();
-        let (input2, _) = client.generate_expr();
-
-        assert_ne!(input1, input2);
-    }
-
-    #[test]
-    async fn client_generates_ascii_variables_at_level_2() {
-        let mut client = client();
-        client.grade = 2;
-
-        let (input, _) = client.generate_expr();
-
-        let parsed = parse(&input);
-        match &parsed[..] {
-            [Value::Sym(name)] => {
-                assert!(name.chars().all(|c| c.is_ascii_alphanumeric()));
-            }
-            _ => panic!("Expected symbol, got {:?}", parsed),
-        }
-    }
-
-    #[test]
-    async fn client_generates_unicode_variables_at_level_3() {
-        let mut client = client();
-        client.grade = 3;
-
-        let (input, _) = client.generate_expr();
-
-        let parsed = parse(&input);
-        match &parsed[..] {
-            [Value::Sym(_)] => (),
-            _ => panic!("Expected symbol, got {:?}", parsed),
-        }
-    }
-
-    #[test]
-    async fn client_generates_binary_application_at_level_4() {
-        let mut client = client();
-        client.grade = 4;
-
-        let (input, _) = client.generate_expr();
-
-        let parsed = parse(&input);
-        match &parsed[..] {
-            [Value::App(_, _)] => (),
-            _ => panic!("Expected symbol, got {:?}", parsed),
-        }
-    }
-
-    #[test]
-    async fn client_generates_nested_applications_and_constants_at_level_5() {
-        let mut client = client();
-        client.grade = 5;
-
-        let (input, _) = client.generate_expr();
-
-        let parsed = parse(&input);
-        match &parsed[..] {
-            [Value::App(_, _)] => (),
-            [Value::Sym(_)] => (),
-            [Value::Num(_)] => (),
-            _ => panic!("Expected symbol, got {:?}", parsed),
-        }
-    }
-
-    #[test]
-    async fn client_generates_lambda_terms_at_level_6() {
-        let mut client = client();
-        client.grade = 6;
-
-        let (input, _) = client.generate_expr();
-
-        let parsed = parse(&input);
-        match &parsed[..] {
-            [Value::Lam(_, _)] => (),
-            _ => panic!("Expected symbol, got {:?}", parsed),
-        }
-    }
-
-    #[test]
-    async fn client_generates_application_with_lambda_terms_at_level_7() {
-        let mut client = client();
-        client.grade = 7;
-
-        let (input, _) = client.generate_expr();
-
-        let parsed = parse(&input);
-        match &parsed[..] {
-            [Value::App(t1, _)] if matches!(**t1, Value::Lam(_, _)) => (),
-            _ => panic!("Expected symbol, got {:?}", parsed),
-        }
-    }
-
-    #[test]
-    async fn client_generates_applications_with_more_than_2_terms_at_level_8() {
-        let mut client = client();
-        client.grade = 8;
-
-        let (input, _) = client.generate_expr();
-
-        let parsed = parse(&input);
-        if let [Value::App(_, _)] = &parsed[..] {
-            assert!(input.split(' ').count() >= 2)
-        }
-    }
-
-    #[test]
-    async fn client_generates_more_complex_terms_at_level_9() {
-        let mut client = client();
-        client.grade = 9;
-
-        let (input, _) = client.generate_expr();
-
-        let parsed = parse(&input);
-
-        assert!(!parsed.is_empty());
-    }
-
-    #[test]
-    async fn client_generates_multiple_terms_at_level_10() {
-        let mut client = client();
-        client.grade = 10;
-
-        let (input, _) = client.generate_expr();
-
-        let parsed = parse(&input);
-
-        assert!(!parsed.is_empty());
-    }
-
-    #[test]
-    async fn client_increases_grade_on_successful_test() {
-        let mut client = client();
-        let test = Test {
-            timestamp: chrono::offset::Utc::now(),
-            result: TestResult::TestSucceeded,
-        };
-
-        client.apply(&test);
-
-        assert_eq!(2, client.grade);
-    }
-
-    #[test]
-    async fn client_stores_test_results() {
-        let mut client = client();
-        let test = Test {
-            timestamp: chrono::offset::Utc::now(),
-            result: TestResult::TestSucceeded,
-        };
-
-        client.apply(&test);
-
-        assert_eq!(test, client.results.first().unwrap().clone());
-    }
-
-    #[test]
-    async fn client_returns_test_successful_if_result_match() {
-        let client = client();
-        let expected = "1".to_string();
-        let response = Ok("1".to_string());
-
-        let test = client.check_result(&expected, &response);
-
-        assert_eq!(TestResult::TestSucceeded, test.result);
-    }
-
-    #[test]
-    async fn client_returns_test_failed_given_result_do_not_match() {
-        let client = client();
-        let expected = "1".to_string();
-        let response = Ok("2".to_string());
-
-        let test = client.check_result(&expected, &response);
-
-        assert_eq!(TestResult::TestFailed("2".to_string()), test.result);
-    }
-
-    #[test]
-    async fn client_does_not_increase_grade_on_failed_test() {
-        let mut client = client();
-        let test = Test {
-            timestamp: chrono::offset::Utc::now(),
-            result: TestResult::TestFailed("2".to_string()),
-        };
-
-        client.apply(&test);
-
-        assert_eq!(1, client.grade);
-    }
-
-    #[test]
-    async fn client_starts_delay_to_next_test_at_10s() {
-        let client = client();
-
-        let delay = client.time_to_next_test();
-
-        assert_eq!(std::time::Duration::from_secs(10), delay);
-    }
-
-    #[test]
-    async fn client_increases_delay_to_next_upon_failed_test() {
-        let mut client = client();
-        let test = Test {
-            timestamp: chrono::offset::Utc::now(),
-            result: TestResult::TestFailed("2".to_string()),
-        };
-        let delay_before = client.time_to_next_test();
-
-        client.apply(&test);
-
-        assert!(delay_before < client.time_to_next_test());
-    }
-
-    #[test]
-    async fn client_increases_delay_to_maximum_of_30s() {
-        let mut client = client();
-        let test = Test {
-            timestamp: chrono::offset::Utc::now(),
-            result: TestResult::TestFailed("2".to_string()),
-        };
-
-        for _ in 0..100 {
-            client.apply(&test);
-        }
-
-        assert_eq!(Duration::from_secs(30), client.time_to_next_test());
-    }
-
-    #[test]
-    async fn client_score_cannot_go_beyond_255() {
-        let mut client = client();
-        let test = Test {
-            timestamp: chrono::offset::Utc::now(),
-            result: TestResult::TestSucceeded,
-        };
-
-        for _ in 0..256 {
-            client.apply(&test);
-        }
-
-        assert_eq!(255, client.grade);
-    }
-
-    #[test]
-    async fn client_decreases_delay_to_next_upon_successful_test() {
-        let mut client = client();
-        let test = Test {
-            timestamp: chrono::offset::Utc::now(),
-            result: TestResult::TestSucceeded,
-        };
-        let delay_before = client.time_to_next_test();
-
-        client.apply(&test);
-
-        assert!(delay_before > client.time_to_next_test());
-    }
-
-    #[test]
-    async fn client_decreases_delay_to_minimum_of_500ms() {
-        let mut client = client();
-        let test = Test {
-            timestamp: chrono::offset::Utc::now(),
-            result: TestResult::TestSucceeded,
-        };
-
-        for _ in 0..100 {
-            client.apply(&test);
-        }
-
-        assert_eq!(Duration::from_millis(500), client.time_to_next_test());
-    }
-}
diff --git a/rust/templates/leaderboard.html b/rust/templates/leaderboard.html
deleted file mode 100644
index 82992d1..0000000
--- a/rust/templates/leaderboard.html
+++ /dev/null
@@ -1,50 +0,0 @@
-<!DOCTYPE html>
-<html>
-
-<head>
-    <meta charset="utf-8">
-    <title>Leaderboard</title>
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <style>
-        table {
-            width: 80%;
-            border-collapse: collapse;
-        }
-
-        table, th, td {
-            border: 1px solid black;
-        }
-
-        th, td {
-            padding: 15px;
-            text-align: left;
-        }
-
-        th {
-            background-color: #f2f2f2;
-        }
-
-        tr:nth-child(even) {
-            background-color: #f2f2f2;
-        }
-
-        .success {
-            background-color: green;
-        }
-
-        .fail {
-            background-color: red;
-        }
-    </style>
-</head>
-
-<body>
-  <h1>Leaderboard</h1>
-  <table>
-    <tr><th>Name</th><th>Grade</th><th>Last test</th></tr>
-    {{#each this.clients}}
-    <tr><td>{{this.name}}</td><td>{{this.grade}}</td><td class="{{#if this.success}}success{{else}}fail{{/if}}">{{this.last_query}}</td></tr>
-    {{/each}}
-  </table>
-</body>
-</html>
diff --git a/rust/tests/interpret_test.rs b/rust/tests/interpret_test.rs
deleted file mode 100644
index 16e7fb7..0000000
--- a/rust/tests/interpret_test.rs
+++ /dev/null
@@ -1,25 +0,0 @@
-use lambda::io::{batch_eval, eval_file, repl};
-
-#[test]
-fn interpreter_can_read_and_interpret_file() {
-    assert_eq!("12 foo true (x x)", eval_file("sample/test.txt"));
-    assert_eq!("true", eval_file("sample/test_full.txt"));
-    assert_eq!("1", eval_file("sample/test_normal.txt"));
-    assert_eq!("13", eval_file("sample/test_let.txt"));
-}
-
-#[test]
-fn repl_can_read_and_interpret_input() {
-    let input = "(def id (lam x x))\n(id 12)";
-    let mut output = Vec::new();
-    repl(&mut input.as_bytes(), &mut output);
-    assert_eq!("> true\n> 12\n> ", String::from_utf8(output).unwrap());
-}
-
-#[test]
-fn repl_can_read_and_interpret_input_in_batch_mode() {
-    let input = "(def id (lam x x))\n(id 12)";
-    let mut output = Vec::new();
-    batch_eval(&mut input.as_bytes(), &mut output);
-    assert_eq!("true\n12\n", String::from_utf8(output).unwrap());
-}
-- 
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