Bam, interpolation on the right-hand-side of style rules.

document_parser.cpp

@@ -717,6 +717,13 @@ namespace Sass {
       return var;
     }
     
+    if (lex< interpolant >())
+    {
+      Token insides(Token::make(lexed.begin + 2, lexed.end - 1));
+      Document interp(line_number, insides, context);
+      return interp.parse_list();
+    }
+    
     syntax_error("error reading values after " + lexed.to_string());
   }
   

interpolation.scss

+$x: bar;
+
+div {
+  a: blah foo#{$x};
+  b: 1 + 123#{4 + 5};
+}
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