On Wed, May 07, 2014 at 02:10:42PM +0300, Michael Snoyman wrote:
Btw, as I can't think of an example right now, what would be an example for code that works with transformers-0.4.0.0 but wouldn't compile anymore with transformers-0.4.1.0?
Surely just the reverse of the breaking change?
https://github.com/ibotty/streaming-commons/commit/b1137852e4f58520ad65d01b2...
No, that code is compatible with transformers 0.3, 0.4, and 0.4.1. With the syntax:
import Data.Functor.Constant (Constant (Constant), getConstant)
We're importing the data type Constrant, the data construct Constant for that data type, and the function getConstant. It doesn't matter if getConstant is a normal function or a field accessor, it can still be accessed by that syntax.
Then I don't understand why field accessors are even *allowed* to be imported beneath the type. Surely that's only necessary to disambiguate constructors from types? Tom