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@@ -220,15 +220,13 @@ END
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       # Resolve multiline rules
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       if node.is_a?(Tree::RuleNode)
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-        continued = node.continued?
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-        while continued
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+        if node.continued?
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           child, index = build_tree(index) if @lines[old_index = index]
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           if @lines[old_index].nil? || has_children?(old_index, tabs) || !child.is_a?(Tree::RuleNode)
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             raise SyntaxError.new("Rules can't end in commas.", @line)
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           end
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-          node.add_rule child
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-          continued = child.continued?
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+          node.add_rules child
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         end
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         node.children = child.children if child
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       end

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@@ -13,9 +13,9 @@ module Sass::Tree
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       Array(rule)
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     end
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-    def add_rule(node)
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+    def add_rules(node)
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       self.rule = rules
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-      rules << node.rule
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+      self.rule += node.rules
0
     end
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     def continued?
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@@ -33,7 +33,7 @@ module Sass::Tree
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       total_rule = if super_rules
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         super_rules.split(",\n").map do |super_line|
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           super_line.strip.split(rule_split).map do |super_rule|
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-            self.rules.flatten.map do |line|
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+            self.rules.map do |line|
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               rule_indent + line.gsub(/,$/, '').split(rule_split).map do |rule|
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                 if rule.include?(PARENT)
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                   rule.gsub(PARENT, super_rule)
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@@ -48,7 +48,7 @@ module Sass::Tree
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         raise Sass::SyntaxError.new("Base-level rules cannot contain the parent-selector-referencing character '#{PARENT}'.", line)
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       else
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         per_rule_indent, total_indent = [:nested, :expanded].include?(@style) ? [rule_indent, ''] : ['', rule_indent]
0
-        total_indent + self.rules.flatten.map do |r|
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+        total_indent + self.rules.map do |r|
0
           per_rule_indent + r.gsub(/,$/, '').gsub(rule_split, rule_separator).rstrip
0
         end.join(line_separator)
0
       end