Description:
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A Segmentation fault occurs if a colon is at the end of a Yaml anchor.

Test script:
---------------
test.yaml
----------
configAnchors:
  - &wrongAnchor:   # This last colon (:) makes the script die
    configKey: configValue

config:
  <<: *wrongAnchor

test.php
---------
<?php
yaml_parse_file('test.yaml');

Expected result:
----------------
PHP Warning:  yaml_parse_file(): scanning error encountered during parsing: did not find expected alphabetic or numeric character (line 2, column 17), context while scanning an anchor (line 2, column 5) in /path/to/test.php on line 2

Actual result:
--------------
Segmentation fault