libghc-async-dev 2.2.2-2build2 (armhf binary) in ubuntu hirsute

 This package provides a higher-level interface over
 threads, in which an (Async a) is a concurrent
 thread that will eventually deliver a value of
 type a. The package provides ways to create
 Async computations, wait for their results, and
 cancel them.
 .
 This package contains the normal library files.