Error: An @import loop has been found: /sass/spec/libsass-issues/issue_1801/simple-import-loop/_susy.scss imports itself
        on line 1 of /sass/spec/libsass-issues/issue_1801/simple-import-loop/_susy.scss
        from line 1 of /sass/spec/libsass-issues/issue_1801/simple-import-loop/_susy.scss
        from line 1 of /sass/spec/libsass-issues/issue_1801/simple-import-loop/input.scss
  Use --trace for backtrace.
