>=dev-haskell/async-2.0:0/2.2.4= dev-haskell/stm:0/2.5.0.2= dev-haskell/unliftio-core:0/0.2.1.0= >=dev-lang/ghc-8.6.3:0/9.2.8= >=dev-haskell/cabal-2.4.0.1
