GHC 2021
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0380-ghc2021.rst
GHC拡張
の多くもdefaultで取り込まれるのか
mrsekut.icon
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0372-ghc-extensions.rst#motivation
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0380-ghc2021.rst
https://www.reddit.com/r/haskell/comments/kzxsve/ghc_2021/
これって何を指した名詞なん
#??
これもGHC拡張の一つなん？
それともv9に付けた別名？