Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
712bb070f9
This PR ensure that `bv_decide` can handle the simp normal form of a shift. Consider: ```lean theorem test1 (b s : BitVec 5) (hb : b = 0) (hs : s ≠ 0) : b <<< s = 0 := by bv_decide ``` This works out, however: ```lean theorem test2 (b s : BitVec 5) (hb : b = 0) (hs : s ≠ 0) : b <<< s = 0 := by simp bv_decide ``` this fails because the `simp` normal form adds `toNat` to the right hand argument of the `<<<` and `bv_decide` cannot deal with shifts by non-constant `Nat`. Discovered by @spdskatr |
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