Description:
------------
If a cast operator inside try {} block throws an exception, the result of casting is never destructed and, thus, a memory leak happens.




Reproduce code:
---------------
<?php
$u = "abc \udc00 def\n";

try {
    echo (binary)$u;
} catch(UnicodeConversionException $e) {

}
?>

INI settings:

unicode_semantics = on
unicode.output_encoding = latin-1
unicode.runtime_encoding = latin-1
unicode.from_error_mode = U_CONV_ERROR_STOP | U_CONV_ERROR_EXCEPTION


Expected result:
----------------
no output

Actual result:
--------------
[Thu Mar 23 23:49:50 2006]  Script:  't.php'
/homes/andrei/dev/php-src/Zend/zend_unicode.c(253) :  Freeing 0x013EC764 (11 bytes), script=t.php
=== Total 1 memory leaks detected ===