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diff --git a/js/src/tests/test262/annexB/language/global-code/switch-case-global-existing-fn-update.js b/js/src/tests/test262/annexB/language/global-code/switch-case-global-existing-fn-update.js
new file mode 100644
index 0000000000..feec1ea5f4
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+++ b/js/src/tests/test262/annexB/language/global-code/switch-case-global-existing-fn-update.js
@@ -0,0 +1,36 @@
+// This file was procedurally generated from the following sources:
+// - src/annex-b-fns/global-existing-fn-update.case
+// - src/annex-b-fns/global/switch-case.template
+/*---
+description: Variable-scoped binding is updated following evaluation (Function declaration in the `case` clause of a `switch` statement in the global scope)
+esid: sec-web-compat-globaldeclarationinstantiation
+flags: [generated, noStrict]
+info: |
+ B.3.3.2 Changes to GlobalDeclarationInstantiation
+ [...]
+ c. When the FunctionDeclaration f is evaluated, perform the following steps
+ in place of the FunctionDeclaration Evaluation algorithm provided in
+ 14.1.21:
+
+ i. Let genv be the running execution context's VariableEnvironment.
+ ii. Let genvRec be genv's EnvironmentRecord.
+ ii. Let benv be the running execution context's LexicalEnvironment.
+ iv. Let benvRec be benv's EnvironmentRecord.
+ v. Let fobj be ! benvRec.GetBindingValue(F, false).
+ vi. Perform ? genvRec.SetMutableBinding(F, fobj, false).
+ vii. Return NormalCompletion(empty).
+---*/
+
+switch (1) {
+ case 1:
+ function f() { return 'inner declaration'; }
+}
+
+assert.sameValue(typeof f, 'function');
+assert.sameValue(f(), 'inner declaration');
+
+function f() {
+ return 'outer declaration';
+}
+
+reportCompare(0, 0);