Upon noticing an error in an external repository, also report the reason Users sometimes find it hard (issue #7850) to identify the root cause of a failure, if it is a fetch in an external repository. As we print a message anyway on observing a failure in a fetch, make this message more helpful by - upgrading it to a proper error message, and - including the message of the actual fetch error. Also ensure that in case of a repository fetch failing due to the execution of `fail` in the implementation function, the message is reported as well. Fixes #7850 Fixes #3683 Change-Id: I70eea4f966c98949e0f57462ac73b2a078552073 PiperOrigin-RevId: 243988092
{Fast, Correct} - Choose two
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