Bug#876635: haskell-cryptol FTBFS: Couldn't match type `t69' with `Pattern PName'

[Adrian Bunk]

Source: haskell-cryptol
Version: 2.4.0-2
Severity: serious
Tags: buster sid

https://buildd.debian.org/status/package.php?p=haskell-cryptol&suite=sid

...
dist-ghc/build/Cryptol/Parser.hs:1329:18: error:
    * Couldn't match type `t69' with `Pattern PName'
      `t69' is a rigid type variable bound by
        the type signature for:
          happyReduce_60 :: forall t69.
                            Happy_GHC_Exts.Int#
                            -> Located Token
                            -> Happy_GHC_Exts.Int#
                            -> Happy_IntList
                            -> HappyStk (HappyAbsSyn t69)
                            -> ParseM (HappyAbsSyn t69)
        at dist-ghc/build/Cryptol/Parser.hs:1328:19
      Expected type: Happy_GHC_Exts.Int#
                     -> Located Token
                     -> Happy_GHC_Exts.Int#
                     -> Happy_IntList
                     -> HappyStk (HappyAbsSyn t69)
                     -> ParseM (HappyAbsSyn t69)
        Actual type: Happy_GHC_Exts.Int#
                     -> Located Token
                     -> Happy_GHC_Exts.Int#
                     -> Happy_IntList
                     -> HappyStk (HappyAbsSyn (Pattern PName))
                     -> ParseM (HappyAbsSyn (Pattern PName))