nac3core: fixed test breakage

nac3core/src/toplevel/composer.rs

@@ -1193,9 +1193,18 @@ impl TopLevelComposer {
                                     unreachable!("must be type var annotation");
                                 }
                             }
-                            get_type_from_type_annotation_kinds(temp_def_list, unifier, primitives, &annotation)?
+                            let dummy_return_type = unifier.get_dummy_var().0;
+                            type_var_to_concrete_def.insert(dummy_return_type, annotation.clone());
+                            dummy_return_type
                         } else {
-                            primitives.none
+                            // if do not have return annotation, return none
+                            // for uniform handling, still use type annoatation
+                            let dummy_return_type = unifier.get_dummy_var().0;
+                            type_var_to_concrete_def.insert(
+                                dummy_return_type,
+                                TypeAnnotation::Primitive(primitives.none),
+                            );
+                            dummy_return_type
                         }
                     };
 

nac3core/src/toplevel/type_annotation.rs

@@ -105,6 +105,8 @@ pub fn parse_ast_to_type_annotation_kinds<T>(
             Ok(TypeAnnotation::CustomClass { id: obj_id, params: vec![] })
         } else if let Ok(ty) = resolver.get_symbol_type(unifier, top_level_defs, primitives, *id) {
             if let TypeEnum::TVar { .. } = unifier.get_ty(ty).as_ref() {
+                let var = unifier.get_fresh_var(Some(*id), Some(expr.location)).0;
+                unifier.unify(var, ty).unwrap();
                 Ok(TypeAnnotation::TypeVar(ty))
             } else {
                 Err(format!("`{}` is not a valid type annotation (at {})", id, expr.location))