Description:
------------
The end label for the second heredoc string is cut off here, with the remainder becoming a T_STRING.

Test script:
---------------
<?php

$code = <<<'CODE'
<?php

<<<TEST
$a 
 TEST;

<<<END
$a
 END;
CODE;

var_dump(token_get_all($code));

Expected result:
----------------
[11]=> array(3) {
  [0]=> int(384)
  [1]=> string(3) " END"
  [2]=> int(9)
}

Actual result:
--------------
[11]=> array(3) {
  [0]=> int(384)
  [1]=> string(3) " EN"
  [2]=> int(9)
}
[12]=> array(3) {
  [0]=> int(319)
  [1]=> string(1) "D"
  [2]=> int(9)
}