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I am seeing this when running exercises:
[WARNING] This document format requires a nonempty <title> element. Please specify either 'title' or 'pagetitle' in the metadata. Falling back to 'exercise.knit.utf8'
We render exercises using a couple of passes here:
@yihui Can you recommend the right workaround to suppress this warning? (or do I recall a recent commit to rmarkdown that would get rid of it globally?)