1 files changed, 39 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/fields/private-field-details.js b/js/src/jit-test/tests/fields/private-field-details.js
new file mode 100644
index 0000000000..1d746c33c8
--- /dev/null
+++ b/js/src/jit-test/tests/fields/private-field-details.js
@@ -0,0 +1,39 @@
+var shouldBeThis;
+
+class A {
+  #nullReturn = false;
+  constructor(nullReturn) {
+    this.#nullReturn = nullReturn;
+  }
+
+  #calls = 0;
+
+  #z =
+      () => {
+        assertEq(this, shouldBeThis);
+        this.#calls++;
+
+        // To test the second optional below.
+        if (this.#nullReturn && this.#calls == 2) {
+          return null;
+        }
+
+        return this;
+      }
+
+  static chainTest(o) {
+    o?.#z().#z()?.#z();
+  }
+};
+
+for (var i = 0; i < 1000; i++) {
+  var a = new A();
+  shouldBeThis = a;
+
+  A.chainTest(a);
+  A.chainTest(null);
+
+  var b = new A(true);
+  shouldBeThis = b;
+  A.chainTest(b);
+}