type mismatch?
Open
Nobody has claimed this yet.
- Dominant language
- Racket
- Stars
- 575
- Forks
- 106
- Avg merge
- 2h 1m
- Merged PRs (30d)
- 2
Description
What version of Racket are you using?
6.8-1~zesty1~ppa2
What program did you run?
#lang typed/racket
(: id (All (a) (-> a a)))
(define (id x) x)
(ann id (All (b) (-> (Stream b) (Stream b))))
What should have happened?
- : (All (b) (-> (Stream b) (Stream b)))
#<procedure:id>
If you got an error message, please include it here.
Type Checker: type mismatch
expected: (All (a) (-> (Stream a) (Stream a)))
given: (All (a) (-> a a)) in: id
Contributor guide
No contributing guide indexed for this repository
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
Start by running the provided #lang typed/racket program with the reported Racket 6.8 version and compare the type-checker result with the expected procedure output. The issue is resolved when annotating id as a polymorphic Stream-to-Stream function is accepted and produces the shown result.
Written by the indexing model from the issue text.
Assessment
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100