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Link to pretty printer library.

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Stephen Diehl
2016-07-02 17:57:44 -04:00
parent b658b4c8ef
commit 2f619f3ebd
1 changed files with 6 additions and 2 deletions
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README.md
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@@ -104,8 +104,9 @@ putLText :: MonadIO m => TL.Text -> m ()
Generally speaking writing manual instances of Show is a [Haskell antipattern]( Generally speaking writing manual instances of Show is a [Haskell antipattern](
http://www.stephendiehl.com/posts/strings.html) because it produces http://www.stephendiehl.com/posts/strings.html) because it produces
law-violating instances of Show. You probably want to use a pretty printer law-violating instances of Show. You probably want to use a [pretty
library for custom printing. printer](https://hackage.haskell.org/package/wl-pprint-text) library for custom
printing.
If backwards compatibility is needed then the base library can be imported If backwards compatibility is needed then the base library can be imported
manually. manually.
@@ -114,6 +115,9 @@ manually.
import GHC.Show (Show(..)) import GHC.Show (Show(..))
``` ```
Automatic deriving of ``Show`` for your types is still supported since the class
is in scope by default.
* **Partial functions like ``undefined`` and ``error`` raise compiler warnings on * **Partial functions like ``undefined`` and ``error`` raise compiler warnings on
usage.** usage.**