Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
54cba90dc5
This PR reverses the relationship between the `ForwardPattern` and `ToForwardSearcher` classes. Previously, it was possible to derive `ForwardPattern` (i.e., `dropPrefix?`) from `ToForwardSearcher` (i.e., get an iterator of `SearchStep (s)`). Now, we give the default instance in the other direction: it is now possible to derive `ToForwardSearcher` from `ForwardPattern`. Since it is usually much easier to provide `ForwardPattern` than `ToForwardSearcher`, this means more shared code, which pays off double since we will give a correctness proof for the default implementation in an upcoming PR. This PR also adds some string lemmas. |
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| lean-toolchain | ||
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