Add failing test

Author: Girgias

Zend/tests/type_declarations/abstract_generics/extended_interface_redeclares_method.phpt

@@ -0,0 +1,18 @@
+--TEST--
+Abstract generic type behaviour in extended interface which redeclares method
+--FILE--
+<?php
+
+interface I1<T> {
+    public function foo(T $param): int;
+}
+
+interface I2<S> extends I1<S> {
+    public function foo(S $param): int;
+}
+
+?>
+DONE
+--EXPECT--
+DONE
+