Invariable-Arity Function
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- Dominant language
- Racket
- Stars
- 575
- Forks
- 106
- Avg merge
- 2h 1m
- Merged PRs (30d)
- 2
Description
What version of Racket are you using?
6.10.1
What program did you run?
#lang typed/racket
(: a (-> Number (List Number)))
(define (a . b)
b)
What should have happened?
I expected this to type check.
If you got an error message, please include it here.
Type Checker: type mismatch
expected: (List Number)
given: (Listof Any) in: b
Contributor guide
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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 with the provided #lang typed/racket reproduction and the variadic definition of a. Inspect how the type checker infers the type of b for an invariable-arity function. Done means the example type checks with b accepted as (List Number), with regression coverage for this behavior.
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
- 30/100