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haskell / mtl

The Monad Transformer Library
http://www.haskell.org/haskellwiki/Monad_Transformers
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add `overwrite` method to `MonadWriter` #146

Closed wygulmage closed 7 months ago

wygulmage commented 8 months ago

overwrite is equivalent to mapWriter without output type change. It allows default definitions of all other methods. It has a default definition in terms of pass and listen.

Normally I would just make mapWriter a method, but unfortunately that would clash with the exports of CPS, Lazy, and Strict. Currently the method order of overwrite is sane for the (,) instance but swapped compared to mapWriter. Would it make more sense to keep the API exactly the same?

Is the benefit worth the API maintenance cost and learning burden?

wygulmage commented 7 months ago

I just noticed that this repo is completely inactive; closing pull request.