'Strict' extension is incompatible with 'deriving' mechanism

This:

{-# LANGUAGE Strict #-}

module Foo where

data Foo = Foo deriving Eq

panics with

ghc.EXE: panic! (the 'impossible' happened)
  (GHC version 8.1.20160317 for x86_64-unknown-mingw32):
        makeCorePair: dfun $dEq_a1zL

Trac metadata

Trac field	Value
Version	8.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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