KT-1822 Error 'cannot infer visibility' required

#KT-1822 fixed

compiler/testData/diagnostics/tests/scopes/kt151.jet

@@ -36,5 +36,5 @@ class F : C(), T {
 }
 
 class G : C(), T {
-    override fun foo() {}
+    public override fun foo() {}
 }

compiler/testData/diagnostics/tests/scopes/kt1822.jet

@@ -0,0 +1,30 @@
+//KT-1822 Error 'cannot infer visibility' required
+package kt1822
+
+open class C {
+    internal open fun foo() {}
+}
+
+trait T {
+    protected fun foo() {}
+}
+
+class G : C(), T {
+    <!CANNOT_INFER_VISIBILITY!>override<!> fun foo() {} //should be an error "cannot infer visibility"; for now 'public' is inferred in such cases
+}
+
+open class A {
+    internal open fun foo() {}
+}
+
+trait B {
+    protected fun foo() {}
+}
+
+trait D {
+    public fun foo() {}
+}
+
+class E : A(), B, D {
+    override fun foo() {}
+}