Use broken YAML that will fail with Syck as well as Psych. Fixes test_broken_yaml_exception in fixtures_test.rb on Ruby 1.8.7.
Use broken YAML that will fail with Syck as well as Psych. Fixes test_broken_yaml_exception in fixtures_test.rb on Ruby 1.8.7.

Cherry-pick from 3-1-stable: b8d46924e70e0847e92e1d2dbaaec8c11381072c

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