Reported / see details in TWiki:Support.INCLUDERevInfoError
REVINFO for earlier revisions is OK in view, but fails in rdiff.
not good. This is a requirement. CC
The intrastructure is not available in Diff.pm to support correct expansion :-/
I am taking the easy way out and simply escape the REVINFO tags for now.
Better diff support is available through TWiki:Plugins.CompareRevisionsAddOn