tree c458a554c045775eedd8b1ad25504b69f9e58db6
parent 41d860cf0e7cb63003d55839b59949752b7fdecc
author Joe Tsai <joetsai@digital-static.net> 1509660208 -0700
committer Joe Tsai <thebrokentoaster@gmail.com> 1509663953 +0000

io: fix Pipe regression with differing error types

Usage of atomic.Value has a subtle requirement that the
value be of the same concrete type. In prior usage, the intention
was to consistently store a value of the error type.
Since error is an interface, the underlying concrete can differ.

Fix this by creating a type-safe abstraction over atomic.Value
that wraps errors in a struct{error} type to ensure consistent types.

Change-Id: Ica74f2daba15e4cff48d2b4f830d2cb51c608fb6
Reviewed-on: https://go-review.googlesource.com/75594
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>