Changes between Version 17 and Version 18 of Proposals/transformers

Timestamp:

11/04/10 18:33:46 (3 years ago)

Author:

ross (IP: 81.98.180.212)

Comment:

fix

Proposals/transformers

@@ -100 +100 @@
 The attached test report lists the packages involved.
 
-=== Transition to mtl-2 ===
+=== Upgrading to mtl-2 ===
 Most packages build unchanged with mtl-2.  Most of the remainder require only small changes to upgrade to it, though that will usually render them incompatible with mtl-1 without some CPP directives.  Here are the fixes for common messages:
 
@@ -110 +110 @@
 
 ''Not in scope: data constructor State''
- The {{{State}}} type is now a type synonym.  You could replace the {{State}} data constructor with the {{state}} function from {{{Control.Monad.Trans.State}}} in the {{{transformers}}} package.
+ The {{{State}}} type is now a type synonym.  You could replace the {{{State}}} data constructor with the {{{state}}} function from {{{Control.Monad.Trans.State}}} in the {{{transformers}}} package.
 
 ''Not in scope: runState''
  You probably imported {{{State(..)}}}, which won't work now that {{{State}}} is a type synonym.  You need to import {{{State}}} and {{{runState}}}.  (That will work with old versions on mtl too.)
 
-''Illegal instance declaration for MyClass (State Foo)''
- If you have a matching instance for {{StateT}}, you can delete this one.  Otherwise you need to generalize your instance to {{StateT}}.  If that's not possible, you may need to introduce a newtype.
+''Illegal instance declaration for Myclass (State Foo)''
+ If you have a matching instance for {{{StateT}}}, you can delete this one.  Otherwise you need to generalize your instance to {{{StateT}}}.  If that's not possible, you may need to introduce a newtype.