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@@ -130,7 +130,7 @@ module Sass
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     private
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     def build_tree
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-      root = Tree::Node.new(nil)
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+      root = Tree::Node.new({})
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       whitespace
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       directives         root
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       rules              root
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@@ -154,7 +154,7 @@ module Sass
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           value = $2
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         end
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-        root << Tree::ValueNode.new("@#{name} #{value};", nil)
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+        root << Tree::ValueNode.new("@#{name} #{value};", {})
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       end
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     end
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@@ -165,7 +165,7 @@ module Sass
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         whitespace
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         if @template.scan(/\{/)
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-          result = Tree::RuleNode.new(rules.join(' '), nil)
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+          result = Tree::RuleNode.new(rules.join(' '), {})
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           root << result
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           rules = []
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@@ -188,7 +188,7 @@ module Sass
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         end
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         assert_match /(;|(?=\}))/
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-        rule << Tree::AttrNode.new(name, value, nil)
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+        rule << Tree::AttrNode.new(name, value, {})
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       end
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       assert_match /\}/
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@@ -236,7 +236,7 @@ module Sass
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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 = Tree::RuleNode.new(rule, {})
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           node.children = child.children
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           node
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         end
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@@ -282,7 +282,7 @@ module Sass
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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.scan(/^(&?(?: .|[^ ])[^.#: \[]*)([.#: \[].*)?$/).first
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-        rules[first] ||= Tree::RuleNode.new(first, nil)
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+        rules[first] ||= Tree::RuleNode.new(first, {})
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         if rest
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           child.rule = "&" + rest
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           rules[first] << child