Skip to content

GitLab

  • Projects
  • Groups
  • Snippets
  • Help
    • Loading...
  • Help
    • Help
    • Support
    • Community forum
    • Submit feedback
  • Sign in / Register
GHC
GHC
  • Project overview
    • Project overview
    • Details
    • Activity
    • Releases
  • Repository
    • Repository
    • Files
    • Commits
    • Branches
    • Tags
    • Contributors
    • Graph
    • Compare
    • Locked Files
  • Issues 4,251
    • Issues 4,251
    • List
    • Boards
    • Labels
    • Service Desk
    • Milestones
    • Iterations
  • Merge Requests 398
    • Merge Requests 398
  • Requirements
    • Requirements
    • List
  • CI / CD
    • CI / CD
    • Pipelines
    • Jobs
    • Schedules
  • Security & Compliance
    • Security & Compliance
    • Dependency List
    • License Compliance
  • Operations
    • Operations
    • Incidents
    • Environments
  • Analytics
    • Analytics
    • CI / CD
    • Code Review
    • Insights
    • Issue
    • Repository
    • Value Stream
  • Wiki
    • Wiki
  • Snippets
    • Snippets
  • Members
    • Members
  • Collapse sidebar
  • Activity
  • Graph
  • Create a new issue
  • Jobs
  • Commits
  • Issue Boards
  • Glasgow Haskell Compiler
  • GHCGHC
  • Issues
  • #5853

Closed
Open
Opened Feb 07, 2012 by Porges@trac-Porges

Out-of-memory crash when using RULES and type families

GHC(i) 7.4.1 crashes with an OOM error on the following code:

{-# LANGUAGE NoImplicitPrelude, TypeFamilies #-}

import Prelude (undefined,Bool(..),Show(..),(.))

type family Elem f :: *
type family Subst f b :: *

class (Subst fa (Elem fa) ~ fa) => F fa where
	(<$>) :: (Elem fa ~ a, Elem fb ~ b,
	          Subst fa b ~ fb, Subst fb a ~ fa) =>
			 (a -> b) -> (fa -> fb)

{-# RULES
"map/map" forall f g xs. f <$> (g <$> xs) = (f.g) <$> xs
	#-}
Trac metadata
Trac field Value
Version 7.4.1
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture
Assignee
Assign to
7.4.2
Milestone
7.4.2
Assign milestone
Time tracking
None
Due date
None
Reference: ghc/ghc#5853