| Index: packages/csslib/lib/src/css_printer.dart
 | 
| diff --git a/packages/csslib/lib/src/css_printer.dart b/packages/csslib/lib/src/css_printer.dart
 | 
| index 91c28612df6dd9379bae23839205afe200458b29..14c1f8c739f0cf6a529e4127fc67056206d56962 100644
 | 
| --- a/packages/csslib/lib/src/css_printer.dart
 | 
| +++ b/packages/csslib/lib/src/css_printer.dart
 | 
| @@ -529,7 +529,7 @@ class CssPrinter extends Visitor {
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|  
 | 
|    void visitVarUsage(VarUsage node) {
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|      emit('var(${node.name}');
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| -    if (!node.defaultValues.isEmpty) {
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| +    if (node.defaultValues.isNotEmpty) {
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|        emit(',');
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|        for (var defaultValue in node.defaultValues) {
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|          emit(' ');
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| 
 |