Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
de65af8318
This PR adds a feature where `inductive` constructors can override the binder kinds of the type's parameters, like in #9480 for `structure`. For example, it's possible to make `x` explicit in the constructor `Eq.refl`, rather than implicit: ```lean inductive Eq {α : Type u} (x : α) : α → Prop where | refl (x) : Eq x x ``` In the Prelude, this is currently accomplished by taking advantage of auto-promotion of indices to parameters. **Breaking change.** Inductive types with a constructor that starts with typeless binders may need to be rewritten, e.g. changing `(x)` to `(x : _)` if there is a `variable` with that name or if it is meant to shadow one of the inductive type's parameters. |
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