Commit 62f5e815 authored by Marcel van Lohuizen's avatar Marcel van Lohuizen
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errors: add Unwrap, Is, and As 

Unwrap, Is and As are as defined in proposal
Issue #29934.

Also add Opaque for enforcing an error cannot
be unwrapped.

Change-Id: I4f3feaa42e3ee7477b588164ac622ba4d5e77cad
Reviewed-on: https://go-review.googlesource.com/c/163558


Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
Reviewed-by: default avatarDamien Neil <dneil@google.com>
parent 37f84817
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