Fields.Accumulator
module T : sig ... end
type (!'input_type0, !'b, !'c1, !'nullable0) t = 'b
constraint
'b =
< contramap : ( 'c -> 'input_type ) Core_kernel.ref
; graphql_fields : 'input_type Input.T.t Core_kernel.ref
; graphql_fields_accumulator : 'c0 T.t list Core_kernel.ref
; nullable_graphql_fields : 'nullable Input.T.t Core_kernel.ref.. >
thunks generating the schema in reverse