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