I will add a error pattern for another YAML library available in Ruby 1.8. The libray name is `Syck`.
And I Will add a test case for the new error pattern.

I have a question for you.
`Syck` library is used on Ruby 1.9.1 or lower and `Psych` library is used on ruby 1.9.2 or higher.
Each library is used on different Ruby version.
How do I run test cases for Syck and Psych at a time?