[issue2785] Unfriendly error message on update to non-existent revision

[Steven Brown]

New submission from Steven Brown <StevenGBrown at gmail.com>:

Mercurial no longer displays a nice error message when updating to a non-
existent revision.

Mercurial 1.8.3:
hg update a
abort: unknown revision 'a'!

Mercurial 1.8.3+25-d8ba6fb2ce15:
hg update a
abort: 00changelog.i at a: ambiguous identifier!

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messages: 16127
nosy: sgbrown
priority: urgent
status: unread
title: Unfriendly error message on update to non-existent revision

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Mercurial issue tracker <bugs at mercurial.selenic.com>
<http://mercurial.selenic.com/bts/issue2785>
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