Currently, rlang includes some custom hooks to ensure that we give high-quality error tracebacks inside Rmds (implemented in r-lib/rlang#1215). We implemented this in rlang for expediency, but I wonder if it's time to move this to knitr?

Similarly, we have been considering ways to make it easier to find where warnings occurred by supplying full backtraces. We have all the machinery to make this work, we just need to add a similar sew() method for warnings. Is this something that might also live in knitr?

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