Regression typechecking type synonym which includes `Any`.
module Foo where import GHC.Exts type Key a = Any
produces the error message on HEAD but compiles on 7.8.3 and 7.10.1 (thanks to Reid for testing).
unsafeany.hs:5:1: error: • The type family ‘Any’ should have no arguments, but has been given none • In the type synonym declaration for ‘Key’ Failed, modules loaded: none.
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