Module type Async_kernel__.Async_invariant.Async.S3

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