ran into another type inference problem

src/ir/arbitrary.rs

@@ -1,5 +1,7 @@
 use crate::eval::PrimitiveType;
-use crate::ir::{Expression, Primitive, Program, TopLevel, Type, TypeWithVoid, Value, ValueOrRef, Variable};
+use crate::ir::{
+    Expression, Primitive, Program, TopLevel, Type, TypeWithVoid, Value, ValueOrRef, Variable,
+};
 use crate::syntax::Location;
 use crate::util::scoped_map::ScopedMap;
 use proptest::strategy::{NewTree, Strategy, ValueTree};
@@ -300,7 +302,8 @@ fn generate_random_expression(
                 if !next_type.is_void() {
                     let name = generate_random_name(rng);
                     env.insert(name.clone(), next_type.clone());
-                    next = Expression::Bind(Location::manufactured(), name, next_type, Box::new(next));
+                    next =
+                        Expression::Bind(Location::manufactured(), name, next_type, Box::new(next));
                 }
                 stmts.push(next);
             }