Commits on Jul 29, 2022

1. secondary: add SummarizeErrors variadic method …

   I was recently debugging a workflow with lots
   of async workers able to cancel each other,
   so that by the time an error bubbled up it was
   ambiguous where the longest stack would be
   and whether there were errors in two places
   because one wrapped the other or because of two
   separate root errors. I felt like what would be
   most convenient would be to smoosh everything
   together rather than try to be too smart about it.
   
   This PR implements SummarizeErrors, which is mainly
   the generalization of CombineErrors over n errors.
   If one argument is detectably already wrapping another,
   the result will ignore the latter. If two errors are
   distinct but both wrapping the same error, the result
   will preserve that information.
   Two errors are distinct if err1 != err2; there didn't
   look to be much benefit in bringing in things like .Is
   as we're really interested in identity, not equivalence.

   

   HonoreDB committed Jul 29, 2022
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