Warning: The install command is a part of the legacy v1 style of cabal usage. Please switch to using either the new project style and the new-install command or the legacy v1-install alias as new-style projects will become the default in the next version of cabal-install. Please file a bug if you cannot replicate a working v1- use case with the new-style commands. For more information, see: https://wiki.haskell.org/Cabal/NewBuild Resolving dependencies... Starting th-abstraction-0.3.1.0 Starting hashable-1.3.0.0 Starting primitive-0.7.0.0 Starting optics-core-0.1 Building hashable-1.3.0.0 Building th-abstraction-0.3.1.0 Building primitive-0.7.0.0 Building optics-core-0.1 Completed hashable-1.3.0.0 Starting unordered-containers-0.2.10.0 Building unordered-containers-0.2.10.0 Completed th-abstraction-0.3.1.0 Completed primitive-0.7.0.0 Starting vector-0.12.0.3 Building vector-0.12.0.3 Completed unordered-containers-0.2.10.0 Completed optics-core-0.1 Downloading optics-th-0.1 Downloaded optics-th-0.1 Starting optics-th-0.1 Building optics-th-0.1 Completed optics-th-0.1 Completed vector-0.12.0.3 Downloading optics-extra-0.1 Downloaded optics-extra-0.1 Starting optics-extra-0.1 Building optics-extra-0.1 Completed optics-extra-0.1 Downloading optics-0.1 Downloaded optics-0.1 Starting optics-0.1 Building optics-0.1 Completed optics-0.1