eeva/servant
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Fix small typos in doc/tutorial/Server.lhs

Browse Source
This commit is contained in:
Manuel Bärenz 2019-04-20 10:52:49 +02:00 committed by GitHub
parent 77d7b3fca3
commit 0ccb02dad1
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
doc/tutorial/Server.lhs
View File

@ -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: