* Old tactic shorthands atac, rtac, etac, dtac, ftac have been
discontinued. INCOMPATIBILITY, use regular assume_tac, resolve_tac etc.
instead (with proper context).
This refers to Isabelle/bbcd4ab6d26e. It is rather unspectacular, but the
practical consequence is a better chance that context discipline is right
by default.
Makarius
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