Error: Mixin "foo" does not accept a content block.
        on line 6 of /home/saper/sw/libsass/sass-spec/spec/libsass-todo-issues/issue_1487/input.scss, in `foo'
        from line 6 of /home/saper/sw/libsass/sass-spec/spec/libsass-todo-issues/issue_1487/input.scss
  Use --trace for backtrace.
