Update test

inputs/failing/copyCounting/subscriptAssignment.ts

@@ -1,16 +0,0 @@
-//! test_output(3)
-// Should be: 2
-
-/// <reference path="../../../concept-code/vs.d.ts" />
-
-export default function main() {
-  const x = Debug.makeCopyCounter("x");
-
-  let obj: Record<string, unknown> = { x }; // First copy
-  obj.y = "y"; // No extra copy
-
-  let arr: unknown[] = [x]; // Second copy
-  arr[1] = "y"; // No extra copy
-
-  return x.count;
-}

inputs/passing/copyCounting/subscriptAssignment.ts

@@ -0,0 +1,25 @@
+//! test_output(0)
+
+/// <reference path="../../../concept-code/vs.d.ts" />
+
+export default function main() {
+  return measure(true) - measure(false);
+}
+
+function measure(assign: boolean) {
+  const x = Debug.makeCopyCounter("x");
+
+  let obj: Record<string, unknown> = { x };
+
+  if (assign) {
+    obj.y = "y";
+  }
+
+  let arr: unknown[] = [x];
+
+  if (assign) {
+    arr[1] = "y";
+  }
+
+  return x.count;
+}