Function types with 2+ arguments and simple proposition fail to parse
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- Dominant language
- Racket
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- 575
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- 106
- Avg merge
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Description
What version of Racket are you using?
6.8.0.1
What program did you run?
#lang typed/racket
(define-type T1 (→ Any Number Boolean : String)) ;; Fails
(define-type T2 (→ Any Number Boolean : #:+ String #:- (! String))) ;; Works
What should have happened?
The first syntax should be accepted
My actual use case is for the following type:
(∀ (A D) (→ Any
(→ Any Boolean : A)
(→ Any Boolean : D)
Boolean : (Pairof A D)))
If you got an error message, please include it here.
→: expected the identifier `:' or expected one of these literals: #:+, #:-, or #:object
parsing context:
while parsing different things... in: String
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- Read the whole issue, then the project's contributing guide.
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Research direction
Reproduce the failure in Racket 6.8.0.1 with the T1 and T2 type definitions, then inspect the parser for → function types with multiple arguments and a simple proposition. Done means the T1 syntax and the shown quantified type are accepted without the reported parsing error, with regression coverage for the failing form.
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
- 42/100