It comes with the territory for a fast moving language with new extensions like -XDerivingVia[1] -XLinearTypes[2], more often than not backed by a publication w

It comes with the territory for a fast moving language with new extensions like -XDerivingVia[1] -XLinearTypes[2], more often than not backed by a publication where its interaction with other features is considered. Some extensions are purely syntactic and are quickly understood -XLambdaCase[3] -XBlockArguments[4] -XMultiWayIf[5]. The compiler will suggest missing extensions. There is enough to hs98 for a lifetime of study (see work of Graham Hutton[6] and Jeremy Gibbons[7]) [1] https://ghc.gitlab.haskell.org/ghc/doc/users_guide/exts/deriving_via.html?highlight=derivingvia#extension-DerivingVia https://ghc.gitlab.haskell.org/ghc/doc/users_guide/exts/deri... [2] https://ghc.gitlab.haskell.org/ghc/doc/users_guide/exts/linear_types.html?highlight=lineartypes#extension-LinearTypes https://ghc.gitlab.haskell.org/ghc/doc/users_guide/exts/line... [3] https://ghc.gitlab.haskell.org/ghc/doc/users_guide/exts/lambda_case.html?highlight=lambdacase#extension-LambdaCase https://ghc.gitlab.haskell.org/ghc/doc/users_guide/exts/lamb... [4] https://ghc.gitlab.haskell.org/ghc/doc/users_guide/exts/block_arguments.html?highlight=xblockarguments#extension-BlockArguments https://ghc.gitlab.haskell.org/ghc/doc/users_guide/exts/bloc... [5] https://ghc.gitlab.haskell.org/ghc/doc/users_guide/exts/multiway_if.html?highlight=multiwayif#extension-MultiWayIf https://ghc.gitlab.haskell.org/ghc/doc/users_guide/exts/mult... [6] https://twitter.com/haskellhutt https://twitter.com/haskellhutt [7] https://twitter.com/jer_gib https://twitter.com/jer_gib