How to include two named functions sequentially in one anonymous function

How do you include two named functions, which are not nested, in one anonymous function?

For example, say I have a file mainFunction.m which contains

function varargout = mainFunction(in1) % in1 is always a cell %% based on what in1 is, output a function using usefulFunction1UsuallyAFile() varargout{1}=@(x)usefulFunction1UsuallyAFile(in1{1},x); %% something else that I'd like to make into the anonymous function %if numel(in1)>1 % mainFunction(in1{2:end}); %end % I need the call of mainFunction(in1{2:end}) to be preferably always grouped with the call of varargout{1} %% main body of mainFunction() % abbreviated: doing something with varargout{1}(...) (one time) %%%% end function out = usefulFunction1UsuallyAFile(in1,in2) out ={in1,in2}; end 

My current solution is instead of

varargout{1}=@(x)usefulFunction1UsuallyAFile(in1,x); 

I do

varargout{1}=@(x){usefulFunction1UsuallyAFile(in1{1},x),... mainFunction(in1{2:end})}; 

And in the caller of mainFunction() and the user of its output, I unwrap the output; as well as handling empty in1 in mainFunction() specifically.

But there are quite a bit of restrictions that come with this solution. For one, I have to modify all the callers of mainFunction() in the case of updating an existing library of functions.

And then, only the output of mainFunction(in1{1}) can be accessed by its caller.

And then there are other restrictions with this structure.

Is there a less restrictive method that maybe uses a more general syntax or function that can combine two functions into 1 anonymous function?