diff --git a/reid/src/mir/linker.rs b/reid/src/mir/linker.rs
index 530faca..e8b66af 100644
--- a/reid/src/mir/linker.rs
+++ b/reid/src/mir/linker.rs
@@ -103,10 +103,10 @@ impl<'map> Pass for LinkerPass<'map> {
             modules.insert(module.name.clone(), Rc::new(RefCell::new((module, tokens))));
         }
 
-        // modules.insert(
-        //     "std".to_owned(),
-        //     Rc::new(RefCell::new(compile_std(&mut self.module_map)?)),
-        // );
+        modules.insert(
+            "std".to_owned(),
+            Rc::new(RefCell::new(compile_std(&mut self.module_map)?)),
+        );
 
         let mut modules_to_process: Vec<Rc<RefCell<(Module, Vec<FullToken>)>>> =
             modules.values().cloned().collect();
diff --git a/reid/tests/e2e.rs b/reid/tests/e2e.rs
index 465a6d7..814bab8 100644
--- a/reid/tests/e2e.rs
+++ b/reid/tests/e2e.rs
@@ -26,9 +26,10 @@ pub static FIBONACCI: &str = include_str!("../../reid_src/fibonacci.reid");
 pub static HELLO_WORLD: &str = include_str!("../../reid_src/hello_world.reid");
 pub static MUTABLE: &str = include_str!("../../reid_src/mutable.reid");
 pub static STRINGS: &str = include_str!("../../reid_src/strings.reid");
-pub static ARRAYS: &str = include_str!("../../reid_src/array.reid");
 pub static STRUCTS: &str = include_str!("../../reid_src/struct.reid");
 pub static ARRAY_STRUCTS: &str = include_str!("../../reid_src/array_structs.reid");
+pub static BORROW: &str = include_str!("../../reid_src/borrow.reid");
+pub static ARITHMETIC: &str = include_str!("../../reid_src/arithmetic.reid");
 
 #[test]
 fn array_compiles_well() {
@@ -69,3 +70,13 @@ fn struct_compiles_well() {
 fn array_structs_compiles_well() {
     test(ARRAY_STRUCTS, "array_structs");
 }
+
+#[test]
+fn borrow_structs_compiles_well() {
+    test(BORROW, "borrow");
+}
+
+#[test]
+fn arithmetic_structs_compiles_well() {
+    test(ARITHMETIC, "arithmetic");
+}