Module type Async_kernel__.Async_invariant.Async.S2

type ('a, 'b) t
val invariant : 'a Async_kernel__.Async_invariant_intf.Async.inv ‑> 'b Async_kernel__.Async_invariant_intf.Async.inv ‑> ('a'bt Async_kernel__.Async_invariant_intf.Async.inv