diff --git a/idea/testData/checker/TraitSupertypeList.jet b/idea/testData/checker/TraitSupertypeList.jet
new file mode 100644
index 00000000000..1648e44d332
--- /dev/null
+++ b/idea/testData/checker/TraitSupertypeList.jet
@@ -0,0 +1,11 @@
+class bar()
+
+trait open class Foo<error>()</error> : bar<error>()</error>, bar, <error>bar</error> {
+    <error>this</error>(x : Int) {}
+}
+
+trait open class Foo2 : bar, Foo {
+}
+
+open class Foo1() : bar(), <error>bar</error>, Foo, Foo<error>()</error> {}
+open class Foo12 : bar<error>()</error>, <error>bar</error> {}
\ No newline at end of file