AnyValues/Inference bug?
Open
Nobody has claimed this yet.
- Dominant language
- Racket
- Stars
- 575
- Forks
- 106
- Avg merge
- 2h 1m
- Merged PRs (30d)
- 2
Description
#lang typed/racket
(call-with-input-string "abcd" (lambda: ([input : Input-Port]) (values 'a 'b)))
That does not type check, but annotating the expression with (Values 'a 'b) does.
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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 by reproducing the typed/racket example using call-with-input-string, the annotated lambda argument, and the two returned symbols. Compare the inferred result with the explicit (Values 'a 'b) annotation, then trace the type-checking path for multiple return values. Done means the unannotated expression type checks consistently, with regression coverage for this example.
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