[stevel@zday:gen] 546$ hg log -r '208:fab087af0243a433b6eb23637fb096d451d06c3e' 
changeset:   208:fab087af0243
user:        stevel@tonic-gate
date:        Wed Jun 14 00:00:00 2006 -0700
summary:     OpenSolaris Launch

[stevel@zday:gen] 547$ hg diff -r '208:fab087af0243a433b6eb23637fb096d451d06c3e'
abort: unknown revision '208:fab087af0243a433b6eb23637fb096d451d06c3e'!
[stevel@zday:gen] 548$