anchor.diff:      BinaryExpression binaryExpression = search;
   
       Token operator = binaryExpression.operator;
  -    DeclaredVariables declaredVariables = context.declaredVariables;
   
       // Comparing constants with length.
       int value = _getIntValue(binaryExpression.rightOperand);
  
positive.code: 
      value = _getIntValue(binaryExpression.leftOperand);
  
      if (value != null) {
        // Constant is on left side of comparison operator.
        if (value == 0) {
  
negative.code: // BSD-style license that can be found in the LICENSE file.
  
  import 'package:analyzer/analyzer.dart';
  import 'package:analyzer/dart/ast/ast.dart';
  import 'package:analyzer/dart/ast/token.dart';
  import 'package:analyzer/dart/element/element.dart';
  import 'package:analyzer/dart/element/type.dart';
  import 'package:linter/src/analyzer.dart';
  
  const alwaysFalse = 'Always false because length is always greater or equal 0.';
  