Error: "a.baz" failed to @extend ".foo.bar".
       No selectors matching ".foo.bar" could be unified with "a.baz".
       Use "@extend .foo.bar !optional" if the extend should be able to fail.
        on line 2 of /sass/spec/extend-tests/094_test_long_extendee_runs_unification/input.scss
  Use --trace for backtrace.
