diff --git a/src/pretty_print_types.rs b/src/pretty_print_types.rs
index 3c0567a20c..f0a503c5d5 100644
--- a/src/pretty_print_types.rs
+++ b/src/pretty_print_types.rs
@@ -39,7 +39,7 @@ fn write_flat_type(flat_type: FlatType, subs: &mut Subs, buf: &mut String, use_p
 
             for arg in args {
                 buf.push_str(" ");
-                write_content(arg, subs, buf, true);
+                write_content(subs.get(arg).content, subs, buf, true);
             }
 
             if write_parens {
diff --git a/src/solve.rs b/src/solve.rs
index 00669559bf..cfa21181c0 100644
--- a/src/solve.rs
+++ b/src/solve.rs
@@ -94,13 +94,9 @@ fn type_to_variable(subs: &mut Subs, typ: Type) -> Variable {
     match typ {
         Variable(var) => var,
         Apply(module_name, name, arg_types) => {
-            let args: Vec<Content> =
+            let args: Vec<Variable> =
                 arg_types.into_iter()
-                    .map(|arg| {
-                        let var = type_to_variable(subs, arg);
-
-                        subs.get(var).content
-                    })
+                    .map(|arg| type_to_variable(subs, arg))
                     .collect();
 
             let flat_type = FlatType::Apply(module_name, name, args);
diff --git a/src/subs.rs b/src/subs.rs
index d40cc8cfa5..e80d3493e0 100644
--- a/src/subs.rs
+++ b/src/subs.rs
@@ -130,7 +130,7 @@ pub enum Content {
 
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub enum FlatType {
-    Apply(String /* module name */, String /* type name */, Vec<Content>),
+    Apply(String /* module name */, String /* type name */, Vec<Variable>),
     Func(Variable, Variable),
     EmptyRecord,
 }
diff --git a/src/unify.rs b/src/unify.rs
index fdb0ee266e..00e5ca5114 100644
--- a/src/unify.rs
+++ b/src/unify.rs
@@ -55,10 +55,11 @@ fn unify_flat_type(left: &FlatType, right: &FlatType) -> Descriptor {
             Apply(l_module_name, l_type_name, l_args),
             Apply(r_module_name, r_type_name, r_args)
         ) if l_module_name == r_module_name && l_type_name == r_type_name => {
-            let args = unify_args(l_args.iter(), r_args.iter());
-            let flat_type = Apply(l_module_name.clone(), l_type_name.clone(), args);
+            panic!("TODO fix this by forking ena");
+            // let args = unify_args(l_args.iter(), r_args.iter());
+            // let flat_type = Apply(l_module_name.clone(), l_type_name.clone(), args);
 
-            from_content(Structure(flat_type))
+            // from_content(Structure(flat_type))
         },
         (Func(_, _), Func(_, _)) => panic!("TODO unify_flat_type for Func"),
         _ => from_content(Error)
diff --git a/tests/test_infer.rs b/tests/test_infer.rs
index 8de94bc38b..a9d431cd1d 100644
--- a/tests/test_infer.rs
+++ b/tests/test_infer.rs
@@ -59,7 +59,7 @@ mod test_infer {
         (loc_expr.value, procedures)
     }
 
-    fn apply(module_name: &str, type_name: &str, args: Vec<Content>) -> Content {
+    fn apply(module_name: &str, type_name: &str, args: Vec<Variable>) -> Content {
         Structure(FlatType::Apply(module_name.to_string(), type_name.to_string(), args))
     }