Odd error about 'DatatypeContexts'

rubik / argon

Monitor cyclomatic complexity in Haskell programs

BSD 3-Clause "New" or "Revised" License

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Open hasufell opened 6 years ago

hasufell commented 6 years ago

DatatypeContexts is deprecated anyway and the following file will yield an error, while it compiles perfectly with ghc-8.0.2:

module Foo where

data Show a => Foo a = Foo a

Error:

src/Foo.hs
    error: 3:6 Illegal datatype context (use DatatypeContexts): Show a =>