From 0ccb02dad1da433778c2106b936bc58c1cc84aba Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Manuel=20B=C3=A4renz?= Date: Sat, 20 Apr 2019 10:52:49 +0200 Subject: [PATCH] Fix small typos in doc/tutorial/Server.lhs --- doc/tutorial/Server.lhs | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/doc/tutorial/Server.lhs b/doc/tutorial/Server.lhs index bbf8ac2c..2714ef89 100644 --- a/doc/tutorial/Server.lhs +++ b/doc/tutorial/Server.lhs @@ -599,7 +599,7 @@ $ curl -H 'Accept: text/html' http://localhost:8081/persons ## The `Handler` monad -At the heart of the handlers is the monad they run in, namely a newtype `Handler` around `ExceptT ServerErroror IO` +At the heart of the handlers is the monad they run in, namely a newtype `Handler` around `ExceptT ServerError IO` ([haddock documentation for `ExceptT`](http://hackage.haskell.org/package/mtl-2.2.1/docs/Control-Monad-Except.html#t:ExceptT)). One might wonder: why this monad? The answer is that it is the simplest monad with the following properties: @@ -622,7 +622,7 @@ action that either returns an error or a result. The module [`Control.Monad.Except`](https://hackage.haskell.org/package/mtl-2.2.1/docs/Control-Monad-Except.html#t:ExceptT) from which `ExceptT` comes is worth looking at. -Perhaps most importantly, `ExceptT` and `Handler` are an instances of `MonadError`, so +Perhaps most importantly, `ExceptT` and `Handler` are instances of `MonadError`, so `throwError` can be used to return an error from your handler (whereas `return` is enough to return a success). @@ -632,8 +632,8 @@ kind and abort early. The next two sections cover how to do just that. ### Performing IO -Another important instances from the list above are `MonadIO m => MonadIO -(ExceptT e m)`, and therefore also `MonadIO Handler` as there is `MonadIO IO` instance. +Other important instances from the list above are `MonadIO m => MonadIO +(ExceptT e m)`, and therefore also `MonadIO Handler` as there is a `MonadIO IO` instance. [`MonadIO`](http://hackage.haskell.org/package/transformers-0.4.3.0/docs/Control-Monad-IO-Class.html) is a class from the **transformers** package defined as: