lib/sass/script/list.rb in sass-3.2.10 vs lib/sass/script/list.rb in sass-3.2.11

@@ -47,10 +47,11 @@
     # @see Node#to_sass
     def to_sass(opts = {})
       return "()" if value.empty?
       precedence = Sass::Script::Parser.precedence_of(separator)
       value.reject {|e| e.is_a?(Null)}.map do |v|
-        if v.is_a?(List) && Sass::Script::Parser.precedence_of(v.separator) <= precedence
+        if v.is_a?(List) && Sass::Script::Parser.precedence_of(v.separator) <= precedence ||
+            separator == :space && v.is_a?(UnaryOperation) && (v.operator == :minus || v.operator == :plus)
           "(#{v.to_sass(opts)})"
         else
           v.to_sass(opts)
         end
       end.join(sep_str(nil))