Fix traverse type signature in documentation comment #2797
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Since `traverse = sequence of (map f traversable)`, and `sequence :: (x -> f x) -> t (f x) -> f (t x)`, `f :: a -> f b` and `traversable :: t a`, the type of `(map f traversable)` is `t (f b)`. Therefore the type parameter `x` in `sequence` is `b`, and the type of the `of` parameter needs to be `b -> f b`.
9 tasks
CrossEye
approved these changes
Jan 23, 2022
|
Somehow, a whole lot of issues/prs were dropped around this time. I don't know if anyone had looked at this one. Thanks, @googol! |
|
I had already forgot about this :D I'm glad it's in now, thanks! |
Closed
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Since
traverse = sequence of (map f traversable), andsequence :: (x -> f x) -> t (f x) -> f (t x),f :: a -> f bandtraversable :: t a, the type of(map f traversable)ist (f b).Therefore the type parameter
xinsequenceisb, and the type of theofparameter needs to beb -> f b.