diff options
| author | Inari Listenmaa <inari.listenmaa@gmail.com> | 2024-09-09 19:43:39 +0200 |
|---|---|---|
| committer | Inari Listenmaa <inari.listenmaa@gmail.com> | 2025-08-02 16:39:31 +0200 |
| commit | b914a25de326dd937e3a1d05f4eefb46af6da7b4 (patch) | |
| tree | e816d5ec4b91425f3f7e41dd8bd75a2681ff524c /src/compiler/GF/Data/BacktrackM.hs | |
| parent | 1037b209ae225d5de604ff832d915c590ced4c38 (diff) | |
define return in terms of pure, >> as *>, mappend as <>
In preparation for deprecation, see https://gitlab.haskell.org/ghc/ghc/-/wikis/proposal/semigroup-monoid and https://gitlab.haskell.org/ghc/ghc/-/wikis/proposal/monad-of-no-return
Diffstat (limited to 'src/compiler/GF/Data/BacktrackM.hs')
| -rw-r--r-- | src/compiler/GF/Data/BacktrackM.hs | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/compiler/GF/Data/BacktrackM.hs b/src/compiler/GF/Data/BacktrackM.hs index 970de5c06..69bc2c29b 100644 --- a/src/compiler/GF/Data/BacktrackM.hs +++ b/src/compiler/GF/Data/BacktrackM.hs @@ -64,11 +64,11 @@ finalStates :: BacktrackM s () -> s -> [s] finalStates bm = map fst . runBM bm instance Applicative (BacktrackM s) where - pure = return + pure a = BM (\c s b -> c a s b) (<*>) = ap instance Monad (BacktrackM s) where - return a = BM (\c s b -> c a s b) + return = pure BM m >>= k = BM (\c s b -> m (\a s b -> unBM (k a) c s b) s b) where unBM (BM m) = m |