| Index: pkg/compiler/lib/src/io/code_output.dart
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| diff --git a/pkg/compiler/lib/src/io/code_output.dart b/pkg/compiler/lib/src/io/code_output.dart
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| index 967de65c7d77640ab38df5ce4445c471b6bc5aa2..7f5b99676b9e7374855f5ff248e2c4044ecc79f3 100644
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| --- a/pkg/compiler/lib/src/io/code_output.dart
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| +++ b/pkg/compiler/lib/src/io/code_output.dart
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| @@ -102,8 +102,12 @@ abstract class AbstractCodeOutput extends CodeOutput {
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|    }
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|  }
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|  
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| +abstract class BufferedCodeOutput {
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| +  String getText();
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| +}
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| +
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|  /// [CodeOutput] using a [StringBuffer] as backend.
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| -class CodeBuffer extends AbstractCodeOutput {
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| +class CodeBuffer extends AbstractCodeOutput implements BufferedCodeOutput {
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|    StringBuffer buffer = new StringBuffer();
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|  
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|    @override
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| 
 |