Misprediction of predicate on substruct
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unsound
- Dominant language
- Racket
- Stars
- 575
- Forks
- 106
- Avg merge
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- Merged PRs (30d)
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Description
#lang typed/racket #:no-optimize
(struct (A) foo ([x : A]))
(struct (A) baz foo ())
(define (f [i : Integer]) : (foo Integer)
(baz i))
(if (baz? (f 1)) 1 2)
Behaves differently under optimization. Reported by Antonio Menezes Leitao on the mailing list.
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Research direction
Run the supplied Typed Racket example with and without optimization and compare the result of the baz? predicate. Trace the predicate handling for the foo/baz substruct relationship; done means the optimized and unoptimized cases agree on the correct predicate 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
- Needs clarification
- Newbie friendliness
- 28/100