Add structured logging of all previously-swallowed errors #48
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This change pulls in the log facade with its key-value feature,
and then uses
inspect_errbefore each call tomap_err(andis_ok) to get the errors surfaced, should a user want to seethem.
I chose
warn!for most of the errors, anddebug!primarilyfor construction/generation tasks, where failures may be less
surprising. I'm not committed to any of the levels, and happy
to remove any that you think aren't useful.