Updating a test.

spec/basic/22_colors_with_alpha/input.scss

+$x: rgb(0, 255, 255);
+
 div {
   color: rgb(255, $blue: 0, $green: 255);
   background: rgb(123, 45, 6);
   flah: rgba(0, 0, 0, 1) + #111;
-  grah: rgba(#fff, .5);
+  grah: rgba($alpha: .5, #f0e);
   blah: rgba(1,2,3,.6);
+  
+  floo: $x;
+  bloo: rgba($x, 0.7);
+  groo: $x;
 }

spec/basic/22_colors_with_alpha/output.css

@@ -2,5 +2,8 @@ div {
   color: yellow;
   background: #7b2d06;
   flah: #111111;
-  grah: rgba(255, 255, 255, 0.5);
-  blah: rgba(1, 2, 3, 0.6); }
+  grah: rgba(255, 0, 238, 0.5);
+  blah: rgba(1, 2, 3, 0.6);
+  floo: aqua;
+  bloo: rgba(0, 255, 255, 0.7);
+  groo: aqua; }