iApply attempt #43
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iApply attempt #43
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This PR is not ready, just an illustration of one possible way forward with iapply.
The fact that we don't have access to a backtracking typeclass search when writing tactics is a difference to the Iris Rocq implementation that could cause trouble for us. Specifically, Rocq uses Ltac's backtracking search plus alongside the stdpp tactic tc_solve to interleave Ltac backtracking search and typeclass resolution, in such a way that the typeclasses it's already tried get ignored. Lean does not have this capability, as far as I understand.
I'm experimenting with using alternate versions of the MoSeL typeclasses with in/out params to see if I can get around this limitation. Specifically, I'm trying to see if we can come up with a different suite of typeclasses that can do all of the backtracking "inside one step of typeclass inference", for the few remaining tactics we have yet to implement.