Use interpolation to concatenate strings in direction-opposite

diff --git a/scss/util/_direction.scss b/scss/util/_direction.scss
index eb600f0fd72ca409e69334831d5d0092aba4bdc6..98a868aa0d295678c61b02830ae10284a2dce4e9 100644 (file)
--- a/scss/util/_direction.scss
+++ b/scss/util/_direction.scss
@@ -17,7 +17,7 @@
   $place: index($dirs, $dir);
 
   @if $place == null {
-    @error 'direction-opposite: Invalid $dir parameter, expected a value from "' + $dirs + '", found "' + $dir + '".';
+    @error 'direction-opposite: Invalid $dir parameter, expected a value from "#{$dirs}", found "#{$dir}".';
     @return null;
   }