Fields.Input
module T : sig ... end
type (!'input_type, !'b, !'c, !'nullable) t = 'b constraint 'b = < contramap : ( 'c -> 'input_type ) Core_kernel.ref ; graphql_fields : 'input_type T.t Core_kernel.ref ; nullable_graphql_fields : 'nullable T.t Core_kernel.ref.. >