1 files changed, 48 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/class/elements/fields-anonymous-function-length.js b/js/src/tests/test262/language/statements/class/elements/fields-anonymous-function-length.js
new file mode 100644
index 0000000000..38280bdfca
--- /dev/null
+++ b/js/src/tests/test262/language/statements/class/elements/fields-anonymous-function-length.js
@@ -0,0 +1,48 @@
+// This file was procedurally generated from the following sources:
+// - src/class-elements/fields-anonymous-function-length.case
+// - src/class-elements/default/cls-decl.template
+/*---
+description: Anonymous functions in field initializer have length properly set (field definitions in a class declaration)
+esid: prod-FieldDefinition
+features: [class-fields-private, class-fields-public, class]
+flags: [generated]
+info: |
+    Updated Productions
+
+    FieldDefinition :
+      ClassElementName Initializer_opt
+
+    InitializeInstanceFields ( O, constructor )
+      1. Assert: Type ( O ) is Object.
+      2. Assert: constructor is an ECMAScript function object.
+      3. Let fields be the value of constructor.[[Fields]].
+      4. For each item fieldRecord in order from fields,
+        a. Perform ? DefineField(O, fieldRecord).
+      5. Return.
+
+    DefineField(receiver, fieldRecord)
+      1. Assert: Type(receiver) is Object.
+      2. Assert: fieldRecord is a Record as created by ClassFieldDefinitionEvaluation.
+      3. Let name be fieldRecord.[[Name]].
+      4. Let initializer be fieldRecord.[[Initializer]].
+      5. If initializer is not empty, then
+        a. Let initValue be ? Call(initializer, receiver).
+      ...
+
+---*/
+
+
+class C {
+  field = function() {};
+  #field = (a, b, c, d) => undefined;
+
+  accessPrivateField() {
+    return this.#field;
+  }
+}
+
+let c = new C();
+assert.sameValue(c.accessPrivateField().length, 4);
+assert.sameValue(c.field.length, 0);
+
+reportCompare(0, 0);