Skip to content
GitLab
Projects Groups Snippets
  • /
  • Help
    • Help
    • Support
    • Community forum
    • Submit feedback
  • Sign in / Register
  • GHC GHC
  • Project information
    • Project information
    • Activity
    • Labels
    • Members
  • Repository
    • Repository
    • Files
    • Commits
    • Branches
    • Tags
    • Contributors
    • Graph
    • Compare
    • Locked Files
  • Issues 5,248
    • Issues 5,248
    • List
    • Boards
    • Service Desk
    • Milestones
    • Iterations
  • Merge requests 564
    • Merge requests 564
  • CI/CD
    • CI/CD
    • Pipelines
    • Jobs
    • Schedules
    • Test Cases
  • Deployments
    • Deployments
    • Releases
  • Analytics
    • Analytics
    • Value stream
    • CI/CD
    • Code review
    • Insights
    • Issue
    • Repository
  • Wiki
    • Wiki
  • Snippets
    • Snippets
  • Activity
  • Graph
  • Create a new issue
  • Jobs
  • Commits
  • Issue Boards
Collapse sidebar
  • Glasgow Haskell CompilerGlasgow Haskell Compiler
  • GHCGHC
  • Issues
  • #9739
Closed
Open
Issue created Oct 29, 2014 by bitonic@trac-bitonic

GHC 7.8 chokes on recursive classes

Type checking this makes GHC 7.8.3 loop:

{-# LANGUAGE MultiParamTypeClasses #-}
module Foo where

class Class3 a => Class1 a where

class Class2 t a where
  class2 :: (Class3 t) => a -> m

class (Class1 t, Class2 t t) => Class3 t where

Does not happen in 7.6.3.

I think it's something to do with the Class3 constraint appearing in class2.

Trac metadata
Trac field Value
Version 7.8.3
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler (Type checker)
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information
Assignee
Assign to
Time tracking