Numbas Error: Equality not defined for type lambda

[William Haynes]

For convenience i have been using lambda functions to format quantities the way I want them to appear, for example

force = f -> siground(qty(f, unit),3)

If I use the lambda function as the correct value for a quantity gap, I see the error under the testing tab for the gap.   Otherwise things work just fine.

For example see:https://numbas.mathcentre.ac.uk/question/201938/moment-balance-l-shape/

Will

[Christian Lawson-Perfect]

The error arises when the editor tries to decide whether to regenerate the question instance used for testing. It compares the values of all variables against the last ones it used and gives up if they're all the same. Equality isn't defined for anonymous functions, so an error is thrown.

I've changed it to skip over values that don't have a defined equality method. I can only see that causing a problem if you have no random variables but somehow make a change to the value of an anonymous function by other means.

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