Test another str-slice spec on Dart Sass.
Test another str-slice spec on Dart Sass.

nschonni/sass-spec,xzyfer/sass-spec,mgreter/sass-spec,nschonni/sass-spec,sass/sass-spec,sass/sass-spec,mgreter/sass-spec,nschonni/sass-spec,sass/sass-spec,nschonni/sass-spec,xzyfer/sass-spec,xzyfer/sass-spec,xzyfer/sass-spec,mgreter/sass-spec,sass/sass-spec