Macro ocaml_interop::impl_conv_ocaml_variant

macro_rules! impl_conv_ocaml_variant {
    ($rust_typ : ty => $ocaml_typ : ty
 {
     $($($tag : ident) :: +
       $(($($slot_name : ident : $slot_typ : ty), + $(,) ?)) ?
       $(=> $conv : expr) ?), + $(,) ?
 }) => { ... };
    ($both_typ : ty { $($t : tt) * }) => { ... };
}

Implements conversion between a Rust enum and an OCaml variant.

See the impl_to_ocaml_variant! and impl_from_ocaml_variant! macros for more details.