racket/typed-racket

refinement type runs into an endless loop

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#672 opened on Feb 28, 2018

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good first issueinferencerefinement

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Description

What version of Racket are you using?

6.12

What program did you run?

#lang typed/racket #:with-refinements
(define-type test (Refine [a : (Pairof Integer Integer)]
                          (<= (car a) (cdr a))))
(ann '(2 . 1) test)

What should have happened?

a type error

If you got an error message, please include it here.

Background expansion abnormally(out of memory)

Contributor guide

Research direction
Investigate the refinement type expansion in Typed Racket to find the infinite loop. Look at the source code for handling refinement types and trace the path that causes out of memory.
Tech stack
None
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitRacket
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25