Fix issue with unevaluated exercise
chunk option in learnr's knitr hooks
#758
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Fixes #757
If symbols – like
T
or a variable – are used in theexercise
chunk option, this would cause an error in the checks that run to validate the exercise chunk by comparing with the source chunk because the source chunk options aren't yet evaluated.This PR evaluates the source chunk option before comparing it with our exercise chunk.