Add two failing examples

examples/list_hard.reid

@@ -0,0 +1,12 @@
+fn main() {
+    let mut a = 5;
+    for i in 0..1000 {
+        for j in 0..1000 {
+            for k in 0..1000 {
+                inner(&mut a);
+            }
+        }
+    }
+}
+
+fn inner(a: &mut i32) {}

examples/ptr_hard.reid

@@ -0,0 +1,8 @@
+fn main() {
+    let mut a = 5;
+    inner(&mut a);
+}
+
+fn inner(a: &mut i32) {
+    *a = *a + 1;
+}

reid/tests/e2e.rs

@@ -124,3 +124,11 @@ fn struct_compiles_well() {
 fn loops_compiles_well() {
     test(include_str!("../../examples/loops.reid"), "test", 10);
 }
+#[test]
+fn ptr_hard_compiles_well() {
+    test(include_str!("../../examples/ptr_hard.reid"), "test", 0);
+}
+#[test]
+fn list_hard_compiles_well() {
+    test(include_str!("../../examples/list_hard.reid"), "test", 0);
+}