Syck and Psych have each different error patterns. If the current Ruby version is 1.9.2 and `make test` run  , A test case for Psych is passed but a test case for Syck is failed. The opposite is also true.

Syck error pattern of yaml-syntax-error.yaml:

	syntax error on line 3, col 5: `  a1: bar'

Psych error pattern of yaml-syntax-error.yaml:

    (<unknown>): mapping values are not allowed in this context at line 4 column 5