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Origin: check. Landing-place: diagnose.
At-seqop used on non-meta-term: x
The At sequent operator applied to a sequent
and a metaterm y yields
where B is the result of replacing
by y in A. The 'At-seqop used on non-meta-term' indicates that y was illformed. The error may indicate an error in the proof or a bug in a tactic.
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