1 files changed, 68 insertions, 0 deletions
diff --git a/js/src/tests/non262/class/superElemDelete.js b/js/src/tests/non262/class/superElemDelete.js
new file mode 100644
index 0000000000..6132cbafc2
--- /dev/null
+++ b/js/src/tests/non262/class/superElemDelete.js
@@ -0,0 +1,68 @@
+// Make sure we get the proper side effects.
+// |delete super[expr]| applies ToPropertyKey on |expr| before throwing.
+
+class base {
+    constructor() { }
+}
+
+class derived extends base {
+    constructor() { super(); }
+    testDeleteElem() {
+        let sideEffect = 0;
+        let key = {
+            toString() {
+                sideEffect++;
+                return "";
+            }
+        };
+        assertThrowsInstanceOf(() => delete super[key], ReferenceError);
+        assertEq(sideEffect, 1);
+    }
+    testDeleteElemPropValFirst() {
+        // The deletion error is a reference error, but by munging the prototype
+        // chain, we can force a type error from JSOP_SUPERBASE.
+        let key = {
+            toString() {
+                Object.setPrototypeOf(derived.prototype, null);
+                return "";
+            }
+        };
+        delete super[key];
+    }
+}
+
+class derivedTestDeleteElem extends base {
+    constructor() {
+        let sideEffect = 0;
+        let key = {
+            toString() {
+                sideEffect++;
+                return "";
+            }
+        };
+
+        assertThrowsInstanceOf(() => delete super[key], ReferenceError);
+        assertEq(sideEffect, 0);
+
+        super();
+
+        assertThrowsInstanceOf(() => delete super[key], ReferenceError);
+        assertEq(sideEffect, 1);
+
+        Object.setPrototypeOf(derivedTestDeleteElem.prototype, null);
+
+        assertThrowsInstanceOf(() => delete super[key], TypeError);
+        assertEq(sideEffect, 2);
+
+        return {};
+    }
+}
+
+var d = new derived();
+d.testDeleteElem();
+assertThrowsInstanceOf(() => d.testDeleteElemPropValFirst(), TypeError);
+
+new derivedTestDeleteElem();
+
+if (typeof reportCompare === 'function')
+    reportCompare(0,0,"OK");