diff --git a/idea/testData/checker/regression/Jet11.jet b/idea/testData/checker/regression/Jet11.jet
new file mode 100644
index 00000000000..d78aa91a35d
--- /dev/null
+++ b/idea/testData/checker/regression/Jet11.jet
@@ -0,0 +1,4 @@
+// JET-11 Redeclaration & Forward reference for classes cause an exception
+class <error>NoC</error>
+class NoC1 : NoC
+class <error>NoC</error>