feat: ieval, isimp and iunfold#490
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Description
Implements the tactics
ieval,isimpandiunfold, corresponding toiEval,iSimplandiUnfold, respectively.Addresses subtasks of #239.
This is a faithful port of the three tactics in the Rocq version, which means the selection pattern must not contain pure hypotheses. The tactic implementation involves constructing the proof of an Iris entailment, so pure hypotheses are out of scope. One subtle difference is that tactics such as
iEval (induction y) in "H1 H2"is a silent no-op in Rocq, whereas in this Lean implementation an error is thrown.Checklist
authorssection of any appropriate files