Randal L. Schwartz wrote:
> MCDiffyVersion>>baseSnapshot
> 
> is trying to send "nil snapshot".
> 
> Oops?

I thought that Monticello-nice.342.mcz had taken care of that:

==================== Summary ====================

Name: Monticello-nice.342
Author: nice
Time: 27 December 2009, 9:03:54 am
UUID: ead29222-29d3-421a-8d89-08d667014c1c
Ancestors: Monticello-bf.341

change #findSnapshotWithVersionInfo: to silently ignore a missing 
ancestor rather than sending #snapshot to nil.
This happens for example when merging Pharo/CollectionTests.
Don't know if this is the good strategy though (maybe a notification 
could be signalled)

+ Cosmetic: move or remove a few temps inside closures


=================================================

Generally, when something like this happens, it's a good idea to open an 
MC browser do a "flush cached versions" and try again. Most times it'll 
just work.

Cheers,
   - Andreas