1 files changed, 31 insertions, 0 deletions
diff --git a/js/src/tests/test262/annexB/language/function-code/switch-case-func-existing-var-no-init.js b/js/src/tests/test262/annexB/language/function-code/switch-case-func-existing-var-no-init.js
new file mode 100644
index 0000000000..603f17b7fc
--- /dev/null
+++ b/js/src/tests/test262/annexB/language/function-code/switch-case-func-existing-var-no-init.js
@@ -0,0 +1,31 @@
+// This file was procedurally generated from the following sources:
+// - src/annex-b-fns/func-existing-var-no-init.case
+// - src/annex-b-fns/func/switch-case.template
+/*---
+description: Existing variable binding is not modified (Function declaration in the `case` clause of a `switch` statement in function scope)
+esid: sec-web-compat-functiondeclarationinstantiation
+flags: [generated, noStrict]
+info: |
+    B.3.3.1 Changes to FunctionDeclarationInstantiation
+
+    [...]
+    2. If instantiatedVarNames does not contain F, then
+    [...]
+---*/
+var init;
+
+(function() {
+  var f = 123;
+  init = f;
+
+  switch (1) {
+    case 1:
+      function f() {  }
+  }
+
+  
+}());
+
+assert.sameValue(init, 123);
+
+reportCompare(0, 0);