Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
a108644461
Resolve cases when the `To/FromJSON` type classes are used with `Empty`, e.g. in the following motivating example. ``` import Lean structure Foo (α : Type) where y : Option α deriving Lean.ToJson #eval Lean.toJson (⟨none⟩ : Foo Empty) -- fails ``` This is a follow-up to this PR https://github.com/leanprover/lean4/pull/5415, as suggested by @eric-wieser. It expands on the original suggestion by also handling `FromJSON`. --------- Co-authored-by: Kyle Miller <kmill31415@gmail.com> |
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