I think since the arrow placeholders are within an @if directive, the mixin can't extend the placeholders. I'm using the inuit.css-web-template and placed a test class at bottom of style.scss using the sample include statement provided with the mixin. Using Sass 3.3.4.
.test { @include arrow(top, left, red); }
"error inuit.css/generic/_mixins.scss (Line 156: ".test" failed to @extend "%arrow--top".
The selector "%arrow--top" was not found."
I think since the arrow placeholders are within an @if directive, the mixin can't extend the placeholders. I'm using the inuit.css-web-template and placed a test class at bottom of style.scss using the sample include statement provided with the mixin. Using Sass 3.3.4.
.test { @include arrow(top, left, red); }
"error inuit.css/generic/_mixins.scss (Line 156: ".test" failed to @extend "%arrow--top". The selector "%arrow--top" was not found."