diamond inheritance in JetDiagnosticsTest

compiler/testData/diagnostics/tests/DiamondFunction.jet

@@ -0,0 +1,9 @@
+open class Base() {
+    fun f() = 1
+}
+    
+open class Left() : Base()
+
+trait Right : Base
+
+class Diamond() : Left(), Right

compiler/testData/diagnostics/tests/DiamondProperty.jet

@@ -0,0 +1,10 @@
+
+open class Base() {
+    var v : Int = 0
+}
+    
+open class Left() : Base()
+
+trait Right : Base
+
+class Diamond() : Left(), Right