Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
e7fc50acb1
This PR improves how `grind` normalizes dependent implications during introduction. Previously, `grind` would introduce a hypothesis `h : p` for a goal of the form `.. ⊢ (h : p) → q h`, and then normalize and assert a non-dependent copy of `p`. As a result, the local context would contain both `h : p` and a separate `h' : p'`, where `p'` is the normal form of `p`. Moreover, `q` would still depend on the original `h`. After this commit, `grind` avoids creating a copy. The context will now contain only `h : p'`, and the new goal becomes `.. ⊢ q (he.mpr_prop h)`, where `he` is a proof of `p = p'`. |
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