librresult-ocaml-dev 0.6.0-1 (s390x binary) in ubuntu hirsute

 Rresult is an OCaml module for handling computation results and
 errors in an explicit and declarative manner, without resorting to
 exceptions. It defines combinators to operate on the result type
 available from OCaml 4.03 in the standard library.
 .
 This package contains the development stuff needed to use the
 rresult library in your programs.