@ sensitivity breaks modules without any extensions enabled.

We got a patch to cabal-install which does

-finalparams @ (DepResolverParams
+finalparams@(DepResolverParams

in a file without any extensions enabled.

Please revert the change for 8.12. This kind of whitespace sensitivity in no-extensions enabled code is non-sense.

EDIT: Proposal 229 should mention @ in the title. Reading https://gitlab.haskell.org/ghc/ghc/-/wikis/migration/8.12, can I now define (@) function in GHC, even it's a reserved-op in Haskell Report?

Edited May 28, 2020 by Oleg Grenrus

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