App Designer add function confused by variable names

I've determined the problem and work around for my particular case, and wish to post it here for posterity.

The problem i encountered is this: when adding a new helper fuction in App Designer, the automatic code generation would occasionally place the new function inside of a previous function. This is visually and syntacally terrible, and i'm pretty sure it bricks most code too.

The source of the buggy behavior seems to be with variables whose names end with the word 'end' . I did NOT name any variable 'end', but 'variable_end' is sufficient to cause the problem.

I was able to create a minimal example.

methods (Access = private)
        
        function results = not_buggy_names(app)
            variable_named_with_endd = 1;
            results = variable_named_with_endd;
        end

    end

If we have the already existing function not_buggy_names and now press the add function button we correctly get the following behavior

    methods (Access = private)
        
        function results = not_buggy_names(app)
            variable_named_with_endd = 1;
            results = variable_named_with_endd;
        end

        
        function results = func2(app)
            % this is correctly placed
        end
    end

However, if instead we have the folowing initial function buggy_names, which contains the string 'end'

methods (Access = private)
        
        function results = buggy_names(app)
            variable_named_with_end = 1;
            results = variable_named_with_end; % this line is the problem, putting comment here doesn't help
            additional_code_doesnt_help = 1;
        end

    end

and now add a new function yields

    methods (Access = private)
        
        function results = buggy_names(app)
            variable_named_with_end = 1;
            results = variable_named_with_end;% this line is the problem, putting comment here doesn't help
            additional_code_doesnt_help = 1;
        
        function results = func2(app)
            % The new function got placed within the previous function, but at the end
        end
        end

    end

The variable with 'end' in the name does seem to need to be at the very end of the line.

For example, this code works fine:

methods (Access = private)
        
        function results = fix_buggy_names(app)
            variable_named_with_end = 1;
            results = variable_named_with_end + 0; % now the line doesn't end with the sting 'end'
        end

    end

which produces

methods (Access = private)
        
        function results = fix_buggy_names(app)
            variable_named_with_end = 1;
            results = variable_named_with_end + 0; % now the line doesn't end with the sting 'end'
        end

        
        function results = func2(app)
            
        end
    end

[Stephen23]

This definitely requires a bug report:

https://www.mathworks.com/support/bug_reports/faq.html

[Michael Van de Graaff]

Oh, thank you. Yeah let me do that!

Answer 1

[Chidvi Modala]

I have brought this issue to the concerned people and it might be fixed in any future release.

[Michael Van de Graaff]

Thank you very much.

Hopefully my post here provided sufficient information for others experiencing this problem to find my conclusion and work around.

[Michael Van de Graaff]

I'd like to furthur note that the same/similar error occurs when I call legend on it's own.

So this breaks:

methods (Access = private)
        
        function results = buggy_ftn(app)
            f = figure;
            ax = axes(f);
            plot(ax,1:15);
            legend % if this is commented, no problem!
            % legend() works, and legend(ax) works, 
        
        function results = func2(app)
            % this function was added to the inside of the previous
            % function, that's not right!
        end
        end
    end

I just did find and replace legend to legend() and everything was fine.

(although best practice, i assume, would be to pass ax to the legend function)