lean-ja / lean-ja/lean-by-example

MonadLift には Lawful バージョンはないのか?

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Description

MonadLift の doc には次のように書かれている。

A function for lifting a computation from an inner Monad to an outer Monad.
Like Haskell's MonadTrans, but n does not have to be a monad transformer.
Alternatively, an implementation of MonadLayer without layerInvmap (so far).

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reading the MonadLift documentation quoted in the issue, then compare the linked Haskell MonadTrans and MonadLayer references. Determine whether a lawful variant is intended and what documentation or API change would be needed; the issue is complete when that question has a documented resolution.

Written by the indexing model from the issue text.

Assessment

Tech stack
haskell
Domain
documentation
Issue type
Documentation
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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