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Diffstat (limited to 'src/compiler/GF/Infra/SIO.hs')
| -rw-r--r-- | src/compiler/GF/Infra/SIO.hs | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/compiler/GF/Infra/SIO.hs b/src/compiler/GF/Infra/SIO.hs index 75c57601b..0ce431380 100644 --- a/src/compiler/GF/Infra/SIO.hs +++ b/src/compiler/GF/Infra/SIO.hs @@ -42,6 +42,7 @@ import qualified GF.Command.Importing as GF(importGrammar, importSource) #ifdef C_RUNTIME import qualified PGF2 #endif +import qualified Control.Monad.Fail as Fail -- * The SIO monad @@ -58,6 +59,9 @@ instance Monad SIO where return x = SIO (const (return x)) SIO m1 >>= xm2 = SIO $ \ h -> m1 h >>= \ x -> unS (xm2 x) h +instance Fail.MonadFail SIO where + fail = liftSIO . fail + instance Output SIO where ePutStr = lift0 . ePutStr ePutStrLn = lift0 . ePutStrLn |