Test case gives away solution!
I didn't think the main MATLAB program counted as a toolbox. Oops.
I think James is right: MATLAB itself isn't normally classified as a "Toolbox". Further, I think there may be another issue too, in that the Test Suite may only be considering Toolboxes from MathWorks, and disregarding third-party Toolboxes (see my Solution 1505802 for more on this), although there is no such restriction in the Problem Statement. On the other hand, that probably wasn't an issue when this problem was created in 2012! —DIV
The answer should be 0. It is written on the FAQ: "Cody supports MATLAB and not the toolboxes".
Sums with Excluded Digits
How to find the position of an element in a vector without using the find function
Arrange Vector in descending order
letter yes yes & letter no no
Check that number is whole number
Toolbox check part 3
Back to basics 18 - justification
Back to basics 16 - byte order
Back to basics 7 - Equal NaNs
Back to basics 25 - Valid variable names
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