Hi, everyone. I'm using the "{(calc)}" recipe at 
Cookbook/MarkupExpressionSamples. I'm
trying to do this:

(:gen:4708003830:)
{(calc '(substr {$:gen} 0 -8) + 3')}

which should return 50, but I just get "input error!". I've tried it a bunch of 
different
ways, but nothing works so far. Might be worth mentioning that if I use the 
"{(math)}"
recipe (from the same page), as in:

{(math (substr {*$:gen} 0 -8) + 3)}

it works fine, however I need to use calc for some of its other features. Any 
ideas?

Thanks,
James

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