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| author | parsonsmatt <parsonsmatt@gmail.com> | 2023-01-03 11:25:41 -0700 |
|---|---|---|
| committer | Marge Bot <ben+marge-bot@smart-cactus.org> | 2023-02-10 09:53:11 -0500 |
| commit | 59556235a8d216b6274ad7966b70b585f585cdaa (patch) | |
| tree | 9324a84bf922745ec23b95ebe2d2e8f5b4df6149 | |
| parent | 11e0cacb039cee4198cd6043ab0d9e08332d4d8a (diff) | |
| download | haskell-59556235a8d216b6274ad7966b70b585f585cdaa.tar.gz | |
Add Lift instance for Fixed
| -rw-r--r-- | libraries/template-haskell/Language/Haskell/TH/Syntax.hs | 10 | ||||
| -rw-r--r-- | libraries/template-haskell/changelog.md | 1 |
2 files changed, 11 insertions, 0 deletions
diff --git a/libraries/template-haskell/Language/Haskell/TH/Syntax.hs b/libraries/template-haskell/Language/Haskell/TH/Syntax.hs index 0304eb130b..8be340bf93 100644 --- a/libraries/template-haskell/Language/Haskell/TH/Syntax.hs +++ b/libraries/template-haskell/Language/Haskell/TH/Syntax.hs @@ -31,6 +31,7 @@ module Language.Haskell.TH.Syntax -- $infix ) where +import qualified Data.Fixed as Fixed import Data.Data hiding (Fixity(..)) import Data.IORef import System.IO.Unsafe ( unsafePerformIO ) @@ -1056,6 +1057,15 @@ instance Lift Natural where liftTyped x = unsafeCodeCoerce (lift x) lift x = return (LitE (IntegerL (fromIntegral x))) +instance Lift (Fixed.Fixed a) where + liftTyped x = unsafeCodeCoerce (lift x) + lift (Fixed.MkFixed x) = do + ex <- lift x + return (ConE mkFixedName `AppE` ex) + where + mkFixedName = + mkNameG DataName "base" "Data.Fixed" "MkFixed" + instance Integral a => Lift (Ratio a) where liftTyped x = unsafeCodeCoerce (lift x) lift x = return (LitE (RationalL (toRational x))) diff --git a/libraries/template-haskell/changelog.md b/libraries/template-haskell/changelog.md index bf63b6e689..8382efd1fc 100644 --- a/libraries/template-haskell/changelog.md +++ b/libraries/template-haskell/changelog.md @@ -7,6 +7,7 @@ * Add `TypeDataD` constructor to the `Dec` type for `type data` declarations (GHC proposal #106). + * Add `instance Lift (Fixed a)` ## 2.19.0.0 |