anchor.diff:  }
   
   class AnalyzerUnlinkedNameGenerator extends AnalyzerExpressionGenerator
  -    with
  -        fasta.ErroneousExpressionGenerator<Expression, Statement, Arguments>,
  -        fasta.UnlinkedGenerator<Expression, Statement, Arguments> {
  +    with fasta.UnlinkedGenerator<Expression, Statement, Arguments> {
     @override
     final Token token;
   
  
positive.code: 
    @override
    Expression buildSimpleRead() => astFactory.simpleIdentifier(token);
  
    @override
    void printOn(StringSink sink) {
      sink.write(", name: ");
      sink.write(name.name);
    }
  }
  
  class AnalyzerVariableUseGenerator extends AnalyzerExpressionGenerator
  
negative.code:       : super(helper, astFactory);
  
    @override
    Expression buildSimpleRead() => astFactory.simpleIdentifier(token);
  }
  
  class AnalyzerUnresolvedNameGenerator extends AnalyzerExpressionGenerator
  