testing/iotest: add ErrReader
Adds an io.Reader that always returns 0 and a non-nil error. Fixes #38781 Change-Id: I56bd124de07bc8809e77c6cfaab33a1e32cfe2ee GitHub-Last-Rev: 4e232b17e9120405d4ea4743350ee361a3505043 GitHub-Pull-Request: golang/go#34741 Reviewed-on: https://go-review.googlesource.com/c/go/+/199501 Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Emmanuel Odeke <emm.odeke@gmail.com>
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