Unfreeze string literals for ParseNode#inspect

lib/haml/parser.rb

@@ -202,7 +202,7 @@ def initialize(*args)
       end
 
       def inspect
-        %Q[(#{type} #{value.inspect}#{children.each_with_object('') {|c, s| s << "\n#{c.inspect.gsub!(/^/, '  ')}"}})]
+        %Q[(#{type} #{value.inspect}#{children.each_with_object(''.dup) {|c, s| s << "\n#{c.inspect.gsub!(/^/, '  ')}"}})].dup
       end
     end
 

test/parser_test.rb

@@ -96,6 +96,14 @@ class ParserTest < Haml::TestCase
       end
     end
 
+    test "inspect for node with children returns text" do
+      text = "some revealed text"
+      cond = "[cond]"
+      node = parse("/!#{cond} #{text}")
+
+      assert_equal "(root nil\n  (comment {:conditional=>\"[cond]\", :text=>\"some revealed text\", :revealed=>true, :parse=>false}))", node.inspect
+    end
+
     test "revealed conditional comments are detected" do
       text = "some revealed text"
       cond = "[cond]"