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| author | Herbert Valerio Riedel <hvr@gnu.org> | 2017-09-05 07:29:36 +0200 |
|---|---|---|
| committer | Herbert Valerio Riedel <hvr@gnu.org> | 2017-09-07 23:43:53 +0200 |
| commit | 8ae263ceb3566a7c82336400b09cb8f381217405 (patch) | |
| tree | 535775c4f739cd23bd443557f2d8f8b939cf711e /libraries/base/GHC/Base.hs-boot | |
| parent | 055d73c6576bed2affaf96ef6a6b89aeb2cd2e9f (diff) | |
| download | haskell-8ae263ceb3566a7c82336400b09cb8f381217405.tar.gz | |
Make Semigroup a superclass of Monoid (re #14191)
Unfortunately, this requires introducing a couple of .hs-boot files to
break up import cycles (mostly to provide class & typenames in order to
be able to write type signatures).
This does not yet re-export `(<>)` from Prelude (while the class-name
`Semigroup` is reexported); that will happen in a future commit.
Test Plan: local ./validate passed
Reviewers: ekmett, austin, bgamari, erikd, RyanGlScott
Reviewed By: ekmett, RyanGlScott
GHC Trac Issues: #14191
Differential Revision: https://phabricator.haskell.org/D3927
Diffstat (limited to 'libraries/base/GHC/Base.hs-boot')
| -rw-r--r-- | libraries/base/GHC/Base.hs-boot | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/libraries/base/GHC/Base.hs-boot b/libraries/base/GHC/Base.hs-boot new file mode 100644 index 0000000000..ca85b49147 --- /dev/null +++ b/libraries/base/GHC/Base.hs-boot @@ -0,0 +1,10 @@ +{-# LANGUAGE NoImplicitPrelude #-} + +module GHC.Base where + +import GHC.Types () + +class Semigroup a +class Monoid a + +data Maybe a = Nothing | Just a |