Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
a9efbf04f4
This PR makes `BitVec.getElem` the simp normal form in case a proof is available and changes `ext` to return `x[i]` + a hypothesis that proves that we are in-bounds. This aligns `BitVec` further with the API conventions of the Lean standard datatypes. We move our proofs to this new normal form, which results in slightly smaller proofs. With the exception of `getElem_ofFin`, no new API surface is added as the `getElem` API has already been completed over the previous months. We also move `getElem_shiftConcat_*` a bit higher as they are needed in earlier proofs. To keep the changeset small, we do not update the API of `BVDecide` but insert `← BitVec.getLsbD_eq_getElem` at the few locations where it is needed. Finally, we add a simproc for getElem, mirroring the existing ones for getLsbD/getMsdD. --------- Co-authored-by: Alex Keizer <alex@keizer.dev> |
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