Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
105c838692
This commit removes a hack that forced first-order unification
to be used to solve unification constraints of the form
?m a =?= f ?x
during elaboration. The hack force first-order unification
even when `?m a` is a higher order pattern and a precise solution
exists.
Moreover, the example that motivated that hack is not applicable
anymore since the type class `has_mem` is now defined as:
```
class has_mem (α : out_param $ Type u) (γ : Type v) := (mem : α → γ → Prop)
```
instead of
```
class has_mem (α : Type u) (γ : Type u → Type v) := (mem : α → γ α → Prop)
```
cc @kha
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