Commits on Jan 6, 2020

1. Support Go 1.13 error chains in Cause …

   Imagine module A imports module B and both use `pkg/errors`. A uses
   `errors.Cause` to inspect wrapped errors returned from B. As-is, B
   cannot migrate from `errors.Wrap` to `fmt.Errorf("%w", err)` because
   that would break `errors.Cause` calls in A. With this change merged,
   `errors.Cause` becomes forwards-compatible with Go 1.13 error chains.
   Module B will be free to switch to `fmt.Errorf("%w", err)` and that will
   not break module A (so long as the top-level project pulls in the newer
   version of `pkg/errors`).

   

   jayschwa committed Jan 6, 2020
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