1 files changed, 41 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/class/elements/privatefieldset-typeerror-1.js b/js/src/tests/test262/language/statements/class/elements/privatefieldset-typeerror-1.js
new file mode 100644
index 0000000000..1bcbb433ef
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+++ b/js/src/tests/test262/language/statements/class/elements/privatefieldset-typeerror-1.js
@@ -0,0 +1,41 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: TypeError when setting private field before the entry was added to [[PrivateFieldValues]]
+esid: sec-putvalue
+info: |
+  PutValue ( V, W )
+    ...
+    6. Else if IsPropertyReference(V), then
+      ...
+      b. If IsPrivateReference(V), then
+        i. Let env be the running execution context's PrivateNameEnvironment.
+        ii. Let field be ? ResolveBinding(GetReferencedName(V), env).
+        iii. Assert: field is a Private Name.
+        iv. Perform ? PrivateFieldSet(field, base, W).
+
+  PrivateFieldSet (P, O, value )
+    1. Assert: P is a Private Name value.
+    2. If O is not an object, throw a TypeError exception.
+    3. Let entry be PrivateFieldFind(P, O).
+    4. If entry is empty, throw a TypeError exception.
+
+  PrivateFieldFind (P, O)
+    1. Assert: P is a Private Name value.
+    2. Assert: O is an object with a [[PrivateFieldValues]] internal slot.
+    3. For each element entry in O.[[PrivateFieldValues]],
+      a. If entry.[[PrivateName]] is P, return entry.
+    4. Return empty.
+
+features: [class, class-fields-private, class-fields-public]
+---*/
+
+class C {
+  y = this.#x = 1;
+  #x;
+}
+
+assert.throws(TypeError, function() { new C(); })
+
+reportCompare(0, 0);