Import orphan instances of MonadFail for ghc<8

Also upgrade alex/happy so automatic install works

1 files changed, 3 insertions, 0 deletions

diff --git a/gf.cabal b/gf.cabal
index 014a2feea..0076e7638 100644
--- 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