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| author | Joey Hess <joeyh@joeyh.name> | 2016-11-11 17:29:11 -0400 |
|---|---|---|
| committer | Joey Hess <joeyh@joeyh.name> | 2016-11-11 17:29:25 -0400 |
| commit | c0d0e57257fe8dee1f9d37a6d49b6322af985a69 (patch) | |
| tree | be921c1ad45c42e6ed1c987fc51d6e9b7e013689 /src/Propellor/EnsureProperty.hs | |
| parent | c24acf55af190bc332b29d0ef4a04dda9335b01a (diff) | |
Clean up build warnings about redundant constraints when built with ghc 8.0.
Only a couple of the constraints were really redundant. The rest are
essential to propellor's tracking of Info propigation, so I silenced the
warning for those.
It would be better to only silence the warning for the functions with the
extra constraints, but IIRC warnings can only be silenced on an entire file
basis.
This commit was sponsored by Andreas on Patreon.
Diffstat (limited to 'src/Propellor/EnsureProperty.hs')
| -rw-r--r-- | src/Propellor/EnsureProperty.hs | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/Propellor/EnsureProperty.hs b/src/Propellor/EnsureProperty.hs index c4666722..e8602047 100644 --- a/src/Propellor/EnsureProperty.hs +++ b/src/Propellor/EnsureProperty.hs @@ -3,6 +3,7 @@ {-# LANGUAGE PolyKinds #-} {-# LANGUAGE TypeFamilies #-} {-# LANGUAGE UndecidableInstances #-} +{-# OPTIONS_GHC -fno-warn-redundant-constraints #-} module Propellor.EnsureProperty ( ensureProperty @@ -37,6 +38,9 @@ import Prelude -- with the property to be lost. ensureProperty :: + -- -Wredundant-constraints is turned off because + -- this constraint appears redundant, but is actually + -- crucial. ( Cannot_ensureProperty_WithInfo inner ~ 'True , (Targets inner `NotSuperset` Targets outer) ~ 'CanCombine ) @@ -45,7 +49,7 @@ ensureProperty -> Propellor Result ensureProperty _ = catchPropellor . getSatisfy --- The name of this was chosen to make type errors a more understandable. +-- The name of this was chosen to make type errors a bit more understandable. type family Cannot_ensureProperty_WithInfo (l :: [a]) :: Bool type instance Cannot_ensureProperty_WithInfo '[] = 'True type instance Cannot_ensureProperty_WithInfo (t ': ts) = |