diff --git a/tests/cases/conformance/classes/classExpressions/genericClassExpressionInFunction.ts b/tests/cases/conformance/classes/classExpressions/genericClassExpressionInFunction.ts
new file mode 100644
index 00000000000..ab2155c0324
--- /dev/null
+++ b/tests/cases/conformance/classes/classExpressions/genericClassExpressionInFunction.ts
@@ -0,0 +1,13 @@
+class A<T> {
+    genericVar: T
+}
+function B<T>() {
+    // class expression can use T
+    return class extends A<T> { }
+}
+// extends can call B
+class K extends B<number>() {
+    name: string;
+}
+var c = new K();
+c.genericVar = 12;