gren-lang / gren-lang/compiler
Underscore type params
Open
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language proposal
- Dominant language
- Haskell
- Stars
- 503
- Forks
- 29
- PR merge metrics
- No merged PRs in 30d
Description
Allow underscore as a type parameter when we do not need the type parameter to match any thing. It would be analogous to using an underscore for a value parameter that we don't use. For example:
listLength : List _ -> Int
As opposed to
listLength : List a -> Int
I think the underscore more clearly conveys the meaning of "This isn't important".
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
No implementation file, test, or entry point is named in the issue. Start by locating the compiler's type-parameter parsing and inference tests, then verify that List _ -> Int is accepted and that the underscore does not need to match a specific type.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- haskell
- Domain
- compilers
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 25/100