Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
5c03ab9630
This PR changes the implementation of a function `unfoldPredRel` used in
(co)inductive predicate machinery, that unfolds pointwise order on
predicates to quantifications and implications. Previous implementation
relied on `withDeclsDND` that could not deal with types which depend on
each other. This caused the following example to fail:
```lean4
inductive infSeq_functor1.{u} {α : Type u} (r : α → α → Prop) (call : {α : Type u} → (r : α → α → Prop) → α → Prop) : α → Prop where
| step : r a b → infSeq_functor1 r call b → infSeq_functor1 r call a
def infSeq1 (r : α → α → Prop) : α → Prop := infSeq_functor1 r (infSeq1)
coinductive_fixpoint monotonicity by sorry
#check infSeq1.coinduct
```
Closes #10234.
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