--- /dev/null
+--TEST--
+validate types
+--SKIPIF--
+<?php
+extension_loaded("psi") or die("skip - need ext/psi");
+?>
+--FILE--
+===TEST===
+<?php
+psi_validate_string("typedef int *(*foo)(int *(*bar)(int baz));");
+?>
+===DONE===
+--EXPECTF--
+===TEST===
+
+Warning: PSI syntax error, unexpected ( at col 26 in %s on line 1
+===DONE===