io: add error check to TeeReader Example
Change-Id: I0b94bdced47483c6412e9979ce2d103fbfc52afb Reviewed-on: https://go-review.googlesource.com/c/go/+/353729 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by:Ian Lance Taylor <iant@golang.org> Trust: Carlos Amedee <carlos@golang.org>
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