Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
4016a80f66
This PR extend the preprocessing of well-founded recursive definitions to bring assumptions like `h✝ : x ∈ xs` into scope automatically. This fixes #5471, and follows (roughly) the design written there. See the module docs at `src/Lean/Elab/PreDefinition/WF/AutoAttach.lean` for details on the implementation. This only works for higher-order functions that have a suitable setup. See for example section “Well-founded recursion preprocessing setup” in `src/Init/Data/List/Attach.lean`. This does not change the `decreasing_tactic`, so in some cases there is still the need for a manual termination proof some cases. We expect a better termination tactic in the near future. |
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