ConstraintKinds seems to be automatically enabled

Wolfgang Jeltsch g9ks157k at
Thu May 4 22:42:08 UTC 2017


In my previous e-mail, I showed some code that uses the Constraint kind.
I forgot to enable the ConstraintKinds extension though, but GHC 8.0.1
did not complain. Is this a bug?

All the best,

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