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Recent changes throw an error when a
-check
chunk is used without anexercise.checker
option (#640).I hadn't realized that the example tutorials use
-check
chunks with simple message, which might be part of an earlier version of learnr. This PR updates the tutorials with a super basic checker that simply evaluates the-check
chunk code and reports it as the feedback message.This unblocks the example tutorials for now, but in the future we should update the example tutorials to use gradethis or other check packages (#650).