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Origin: check. Landing-place: diagnose.
Verify-seqop used on non-endorsement: R
The verify sequent operator applied to a sequent
yields
provided the side condition s is true. Thus, the verify operator allows to remove a satisfied side condition. The 'Verify-seqop used on non-endorsement' indicates that the conclusion of the sequent did not have form
. The error may indicate an error in the proof or a bug in a tactic.
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