diff --git a/compiler/testData/diagnostics/tests/DiamondFunctionGeneric.jet b/compiler/testData/diagnostics/tests/DiamondFunctionGeneric.jet
new file mode 100644
index 00000000000..aa22ec900e8
--- /dev/null
+++ b/compiler/testData/diagnostics/tests/DiamondFunctionGeneric.jet
@@ -0,0 +1,9 @@
+open class Base<P>() {
+    fun f() = 1
+}
+    
+open class Left<P>() : Base<P>()
+
+trait Right<P> : Base<P>
+
+class Diamond<P>() : Left<P>(), Right<P>