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@@ -12,7 +12,7 @@ module Treetop
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           parser = MetagrammarParser.new
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           result = parser.parse(source_file.read)
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           unless result
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-            raise RuntimeError.new(parser.terminal_failures.map {|failure| failure.to_s}.join("\n"))
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+            raise RuntimeError.new(parser.failure_reason)
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           end
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           result.compile
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         end