getting closer ...

src/ir/arbitrary.rs

@@ -359,19 +359,21 @@ fn generate_random_expression(
                 .iter()
                 .filter_map(|(variable, ty)| {
                     if ty.is_printable() {
-                        Some(variable.clone())
+                        Some((variable.clone(), ty.clone()))
                     } else {
                         None
                     }
                 })
-                .collect::<Vec<Variable>>();
+                .collect::<Vec<_>>();
 
             if possible_variables.is_empty() {
                 generate_random_binding(rng, env)
             } else {
+                let (variable, var_type) = possible_variables.choose(rng).unwrap();
+
                 Expression::Print(
                     Location::manufactured(),
-                    possible_variables.choose(rng).unwrap().clone(),
+                    ValueOrRef::Ref(Location::manufactured(), var_type.clone(), variable.clone()),
                 )
             }
         }