Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
c797525d2a
This PR allows the use of `dsimp` during preprocessing of well-founded definitions. This fixes regressions when using `if-then-else` without giving a name to the condition, but where the condition is needed for the termination proof, in cases where that subexpression is reachable only by dsimp, but not by simp (e.g. inside a dependent let) Also fixes some preprocessing lemmas to not be bad simp lemmas (with lambdas on the LHS, due to dot notation and unfortunate argument order) This fixes #7408. |
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