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| author | Herbert Valerio Riedel <hvr@gnu.org> | 2014-09-15 08:37:30 +0200 |
|---|---|---|
| committer | Herbert Valerio Riedel <hvr@gnu.org> | 2014-09-15 08:37:39 +0200 |
| commit | c0fa383d9109800a4e46a81b418f1794030ba1bd (patch) | |
| tree | 19dc80e4d266eb6fd7b56b6f61d4f7ed4f10a097 /compiler/hsSyn | |
| parent | 004c5f4fec78414943d788c2a8b42a4500272949 (diff) | |
| download | haskell-c0fa383d9109800a4e46a81b418f1794030ba1bd.tar.gz | |
Export `Traversable()` and `Foldable()` from Prelude
This exposes *only* the type-classes w/o any of their methods.
This is the very first step for implementing BPP (see #9586), which
already requires breaking up several import-cycles leading back to `Prelude`.
Ideally, importing `Prelude` should be avoided in most `base` modules,
as `Prelude` does not define any entities, but rather re-exports
existing ones.
Test Plan: validate passes
Reviewers: ekmett, austin
Reviewed By: ekmett, austin
Subscribers: simonmar, ezyang, carter
Differential Revision: https://phabricator.haskell.org/D209
GHC Trac Issues: #9586
Diffstat (limited to 'compiler/hsSyn')
| -rw-r--r-- | compiler/hsSyn/HsDecls.lhs | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/compiler/hsSyn/HsDecls.lhs b/compiler/hsSyn/HsDecls.lhs index f584372385..3d412874fd 100644 --- a/compiler/hsSyn/HsDecls.lhs +++ b/compiler/hsSyn/HsDecls.lhs @@ -4,6 +4,7 @@ % \begin{code} +{-# LANGUAGE CPP #-} {-# LANGUAGE DeriveDataTypeable, DeriveFunctor, DeriveFoldable, DeriveTraversable #-} {-# LANGUAGE StandaloneDeriving #-} @@ -98,8 +99,10 @@ import FastString import Bag import Data.Data hiding (TyCon,Fixity) -import Data.Foldable (Foldable) -import Data.Traversable +#if __GLASGOW_HASKELL__ < 709 +import Data.Foldable ( Foldable ) +import Data.Traversable ( Traversable ) +#endif import Data.Maybe \end{code} |