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| author | Andreas Källberg <anka.213@gmail.com> | 2020-08-05 16:51:24 +0200 |
|---|---|---|
| committer | Andreas Källberg <anka.213@gmail.com> | 2020-08-05 18:48:24 +0200 |
| commit | b8812b54b2dd70df1038a5cd953b4bbb8ac1e9b4 (patch) | |
| tree | 1e61a2cd878ddf124d83903cdb63f9f5e9f48725 /src/compiler/GF/Data/BacktrackM.hs | |
| parent | 251845f83ea52965b5205fd231ffa2c87bb34de6 (diff) | |
fix newer ghc: Don't try to be backwards compatible
Diffstat (limited to 'src/compiler/GF/Data/BacktrackM.hs')
| -rw-r--r-- | src/compiler/GF/Data/BacktrackM.hs | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/compiler/GF/Data/BacktrackM.hs b/src/compiler/GF/Data/BacktrackM.hs index f5ae63997..87ea4dc5a 100644 --- a/src/compiler/GF/Data/BacktrackM.hs +++ b/src/compiler/GF/Data/BacktrackM.hs @@ -69,6 +69,8 @@ instance Monad (BacktrackM s) where return a = BM (\c s b -> c a s b) BM m >>= k = BM (\c s b -> m (\a s b -> unBM (k a) c s b) s b) where unBM (BM m) = m + +instance MonadFail (BacktrackM s) where fail _ = mzero instance Functor (BacktrackM s) where |