Add some tests that make the compiler panick.

examples/tests/b/aiken.toml

@@ -0,0 +1,2 @@
+name = "test_b"
+version = "0.0.0"

examples/tests/b/lib/main.ak

@@ -0,0 +1,11 @@
+pub fn repeat(x: a, n: Int) -> List(a) {
+  if n <= 0 {
+    []
+  } else {
+    [x, ..repeat(x, n - 1)]
+  }
+}
+
+test repeat_1() {
+  repeat("aiken", 0) == []
+}