1 files changed, 21 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/plain-object-prototypes.js b/js/src/jit-test/tests/basic/plain-object-prototypes.js
new file mode 100644
index 0000000000..c53f0c9e16
--- /dev/null
+++ b/js/src/jit-test/tests/basic/plain-object-prototypes.js
@@ -0,0 +1,21 @@
+const prototypes = [
+    Map.prototype,
+    Set.prototype,
+    WeakMap.prototype,
+    WeakSet.prototype,
+    Date.prototype,
+    Error.prototype,
+    InternalError.prototype,
+    EvalError.prototype,
+    RangeError.prototype,
+    ReferenceError.prototype,
+    SyntaxError.prototype,
+    TypeError.prototype,
+    URIError.prototype,
+    RegExp.prototype,
+];
+
+for (const prototype of prototypes) {
+    delete prototype[Symbol.toStringTag];
+    assertEq(Object.prototype.toString.call(prototype), "[object Object]");
+}