anchor.diff:  
     @override
     R visitFunctionExpressionInvocation(FunctionExpressionInvocation node) =>
  -      visitExpression(node);
  +      visitInvocationExpression(node);
   
     @override
     R visitFunctionTypeAlias(FunctionTypeAlias node) => visitTypeAlias(node);
  
positive.code:   R visitMethodDeclaration(MethodDeclaration node) => visitClassMember(node);
  
    @override
    R visitMethodInvocation(MethodInvocation node) => visitExpression(node);
  
    R visitNamedCompilationUnitMember(NamedCompilationUnitMember node) =>
        visitCompilationUnitMember(node);
  
negative.code:   R visitInterpolationString(InterpolationString node) =>
        visitInterpolationElement(node);
  
    R visitInvocationExpression(InvocationExpression node) =>
        visitExpression(node);
  
    @override
    R visitIsExpression(IsExpression node) => visitExpression(node);
  
  