Add test against redeclaring an overloaded method abstract

tests/classes/abstract_redeclare.phpt

@@ -0,0 +1,22 @@
+--TEST--
+A method cannot be redeclared abstrcat
+--SKIPIF--
+<?php if (version_compare(zend_version(), '2.0.0-dev', '<')) die('skip ZendEngine 2 needed'); ?>
+--FILE--
+<?php
+
+class pass {
+	function show() {
+		echo "Call to function show()\n";
+	}
+}
+
+class fail extends pass {
+	abstract function show();
+}
+
+echo "Done\n"; // Shouldn't be displayed
+?>
+--EXPECTF--
+
+Fatal error: Cannot redeclare pass::show() abstract in class fail in %s on line %d