--- /dev/null
+--TEST--
+validate types
+--SKIPIF--
+<?php
+extension_loaded("psi") or die("skip - need ext/psi");
+?>
+--FILE--
+===TEST===
+<?php
+psi_validate_string(
+<<<PSI
+enum {
+ A,
+ B = A + 2,
+ C = X
+}
+PSI
+);
+?>
+===DONE===
+--EXPECTF--
+===TEST===
+
+Warning: Unknown variable 'X' in numeric expression in %s on line 4
+===DONE===