Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
4ee131981d
This modification is relevant for fixing regressions on recent changes to the auto implicit behavior for inductive families. The following declarations are now accepted: ```lean inductive HasType : Fin n → Vector Ty n → Ty → Type where | stop : HasType 0 (ty :: ctx) ty | pop : HasType k ctx ty → HasType k.succ (u :: ctx) ty inductive Sublist : List α → List α → Prop | slnil : Sublist [] [] | cons l₁ l₂ a : Sublist l₁ l₂ → Sublist l₁ (a :: l₂) | cons2 l₁ l₂ a : Sublist l₁ l₂ → Sublist (a :: l₁) (a :: l₂) inductive Lst : Type u → Type u | nil : Lst α | cons : α → Lst α → Lst α ``` TODO: universe inference for `inductive` should be improved. The current approach is not good enough when we have auto implicits. TODO: allow implicit fixed indices that do not depend on indices that cannot be moved to become parameters. |
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This is the repository for Lean 4, which is currently being released as milestone releases towards a first stable release. Lean 3 is still the latest stable release.
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