1 files changed, 8 insertions, 2 deletions
diff --git a/rust/src/lambda.rs b/rust/src/lambda.rs
index d1ab5b5..9b7045f 100644
--- a/rust/src/lambda.rs
+++ b/rust/src/lambda.rs
@@ -1,3 +1,8 @@
+use proptest::{
+    arbitrary::{any, any_with, arbitrary_with},
+    strategy::{Strategy, ValueTree},
+    test_runner::TestRunner,
+};
 use rand::{rngs::SmallRng, Rng, RngCore, SeedableRng};
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
@@ -98,12 +103,13 @@ fn gensym() -> String {
     format!("x_{}", n1)
 }
 
-pub fn generate_expr<R: Rng>(size: u32, rng: &mut R) -> Value {
+pub fn generate_expr(size: u32, runner: &mut TestRunner) -> Value {
     match size {
         0 | 1 => {
-            let n: u16 = rng.gen();
+            let n = any::<u16>().new_tree(runner).unwrap().current();
             Value::Num(n.into())
         }
+        2 => Value::Sym(identifier().new_tree(runner).unwrap().current()),
         _ => todo!(),
     }
 }