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Origin: check. Landing-place: diagnose.
Endorse-seqop used on non-meta term: x
The Endorse sequent operator applied to a sequent 
and a metaterm s yields 
. Thus, the Endorse operator allows to move a side condition s from the set of assumed side conditions to the conclusion. The Endorse operator can be used for hypothetical reasoning like 'Assume x is free for y in z, prove some lemma, conclude that if x is free for y in z then the lemma holds'. In this case, 'x is free for y in z' serves as side condition s.
The 'Endorse-seqop used on non-meta term' indicates that the side condition s was illformed. The error may indicate an error in the proof or a bug in a tactic.
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