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| author | John J. Camilleri <john@johnjcamilleri.com> | 2020-09-14 22:42:37 +0200 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2020-09-14 22:42:37 +0200 |
| commit | 6c54e5b63cb563d780843a1970cba0718a5203f8 (patch) | |
| tree | ed6777f6cb20f9212fa29ce68fac7e22745c707c /src/compiler/GF/Infra/UseIO.hs | |
| parent | bca0691cb028fe33ae1b77e71752d4e937490ff1 (diff) | |
| parent | 8bcdeedba01847325cc89378fed114bc0561bd4d (diff) | |
Merge pull request #71 from anka-213/fix-newer-cabal
Fix support for newer stackage snapshots
Diffstat (limited to 'src/compiler/GF/Infra/UseIO.hs')
| -rw-r--r-- | src/compiler/GF/Infra/UseIO.hs | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/compiler/GF/Infra/UseIO.hs b/src/compiler/GF/Infra/UseIO.hs index e27b6e075..4c5a26d32 100644 --- a/src/compiler/GF/Infra/UseIO.hs +++ b/src/compiler/GF/Infra/UseIO.hs @@ -159,6 +159,9 @@ instance ErrorMonad IO where then h (ioeGetErrorString e) else ioError e {- +-- Control.Monad.Fail import will become redundant in GHC 8.8+ +import qualified Control.Monad.Fail as Fail + instance Functor IOE where fmap = liftM instance Applicative IOE where @@ -170,7 +173,15 @@ instance Monad IOE where IOE c >>= f = IOE $ do x <- c -- Err a appIOE $ err raise f x -- f :: a -> IOE a + + #if !(MIN_VERSION_base(4,13,0)) + fail = raise + #endif + +instance Fail.MonadFail IOE where fail = raise + + -} -- | Print the error message and return a default value if the IO operation 'fail's |