diff options
| author | Herbert Valerio Riedel <hvr@gnu.org> | 2015-12-08 11:11:11 +0100 |
|---|---|---|
| committer | Herbert Valerio Riedel <hvr@gnu.org> | 2015-12-08 11:15:49 +0100 |
| commit | fd3b845c01aa26b6e5cd12c00af59e5468e21b1b (patch) | |
| tree | a6048cc545e9db073a1213aaa03ad02c8ef66531 /ghc | |
| parent | 9f4ca5afaccc8a397d8ee91b5423a9c2fcd151ce (diff) | |
| download | haskell-fd3b845c01aa26b6e5cd12c00af59e5468e21b1b.tar.gz | |
Make HasDynFlags more transformers friendly
Ideally, we'd have the more general
instance (MonadTrans t, Monad m, HasDynFlags m) => HasDynFlags (t m) where
getDynFlags = lift getDynFlags
definition. However, that one would overlap with the `HasDynFlags (GhcT m)`
instance. Instead we define instances for a couple of common Monad
transformers explicitly in order to avoid nasty overlapping instances.
This is a preparatory refactoring for #10874
Reviewed By: austin
Differential Revision: https://phabricator.haskell.org/D1581
Diffstat (limited to 'ghc')
| -rw-r--r-- | ghc/InteractiveUI.hs | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/ghc/InteractiveUI.hs b/ghc/InteractiveUI.hs index 02a8670ef1..7fd9c8b1ab 100644 --- a/ghc/InteractiveUI.hs +++ b/ghc/InteractiveUI.hs @@ -849,7 +849,7 @@ runOneCommand eh gCmd = do checkInputForLayout :: String -> InputT GHCi (Maybe String) -> InputT GHCi (Maybe String) checkInputForLayout stmt getStmt = do - dflags' <- lift $ getDynFlags + dflags' <- getDynFlags let dflags = xopt_set dflags' Opt_AlternativeLayoutRule st0 <- getGHCiState let buf' = stringToStringBuffer stmt |