Import orphan instances of MonadFail for ghc<8

Also upgrade alex/happy so automatic install works
2020-09-09 11:05:41 +02:00
parent 150b592aa9
commit 9d8cd55cd5
4 changed files with 23 additions and 1 deletions
--- a/gf.cabal
+++ b/gf.cabal
@@ -83,6 +83,9 @@ Library
                 mtl,
                 exceptions,
                 fail,
+                 -- For compatability with ghc < 8
+                 -- We need transformers-compat >= 0.6.3, but that is only in newer snapshots where it is redundant.
+                 transformers-compat,
                 ghc-prim
  hs-source-dirs: src/runtime/haskell