define-struct/exec can't be annotated with the function type
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- Dominant language
- Racket
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Description
What version of Racket are you using?
6.6.0.5
What program did you run?
#lang typed/racket
(define-struct/exec foo ()
[(λ (self) self) : (→ foo foo)])
(ann (foo) foo)
(ann (foo) (→ foo)) ;; fails
(ann (foo) (∩ foo (→ foo))) ;; fails
What should have happened?
The program should typecheck. The type of (foo) should be something along the lines of (∩ foo (→ foo)), so that it can be passed as an argument to (λ ([x : foo]) x) and to (λ ([x : (→ foo)]) (x))
If you got an error message, please include it here.
Type Checker: type mismatch
expected: (-> foo)
given: foo in: (foo)
Type Checker: type mismatch
expected: (∩ foo (-> foo))
given: foo in: (foo)
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 by running the minimal typed/racket program in the issue and inspect the type-checking path for define-struct/exec values. Done means the program typechecks and (foo) is accepted both as foo and as (→ foo), including the intersection annotation and calls described.
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