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@@ -118,6 +118,7 @@ module Sass
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       whitespace
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       directives    root
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       rules         root
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+      expand_commas root
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       nest_rules    root
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       flatten_rules root
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       root
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@@ -194,6 +195,34 @@ module Sass
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       whitespace
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     end
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+    # Transform
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+    #
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+    #   foo, bar, baz
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+    #     color: blue
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+    #
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+    # into
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+    #
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+    #   foo
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+    #     color: blue
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+    #   bar
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+    #     color: blue
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+    #   baz
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+    #     color: blue
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+    #
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+    # Yes, this expands the amount of code,
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+    # but it's necessary to get nesting to work properly.
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+    def expand_commas(root)
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+      root.children.map! do |child|
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+        next child unless Tree::RuleNode === child && child.rule.include?(',')
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+        child.rule.split(',').map do |rule|
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+          node = Tree::RuleNode.new(rule, nil)
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+          node.children = child.children
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+          node
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+        end
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+      end
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+      root.children.flatten!
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+    end
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+
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     # Nest rules so that
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     #
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     #   foo
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@@ -214,8 +243,7 @@ module Sass
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     # 
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     def nest_rules(root)
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       rules = OrderedHash.new
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-      root.children.dup.each do |child|
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-        next unless child.is_a? Tree::RuleNode
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+      root.children.select { |c| Tree::RuleNode === c }.each do |child|
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         root.children.delete child
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         first, rest = child.rule.split(' ', 2)
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         rules[first] ||= Tree::RuleNode.new(first, nil)