Skip to content
GitLab
Projects Groups Topics Snippets
  • /
  • Help
    • Help
    • Support
    • Community forum
    • Submit feedback
  • Register
  • Sign in
  • GHC GHC
  • Project information
    • Project information
    • Activity
    • Labels
    • Members
  • Repository
    • Repository
    • Files
    • Commits
    • Branches
    • Tags
    • Contributor statistics
    • Graph
    • Compare revisions
    • Locked files
  • Issues 5.6k
    • Issues 5.6k
    • List
    • Boards
    • Service Desk
    • Milestones
    • Iterations
  • Merge requests 654
    • Merge requests 654
  • CI/CD
    • CI/CD
    • Pipelines
    • Jobs
    • Artifacts
    • Schedules
    • Test cases
  • Deployments
    • Deployments
    • Releases
  • Packages and registries
    • Packages and registries
    • Model experiments
  • Analytics
    • Analytics
    • 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
  • #7489

Obscure warning: Var/Type length mismatch when using GADTs and TypeFamilies

GHC 7.4.2 and 7.6.1 both write obscure warning without any link to source line:

$ ghc --make test.hs
[1 of 1] Compiling Main             ( test.hs, test.o )
Var/Type length mismatch: 
    []
    [main:Main.Credit{tc ra2}]
Var/Type length mismatch: 
    []
    [main:Main.Debit{tc ra1}]
Linking test ...

Near to minimal example (my real program is quite big and uses GHC type system a lot): http://hpaste.org/78958

GHC 7.4.2 output: http://hpaste.org/78959

GHC 7.6.1 output: http://hpaste.org/78961

Trac metadata
Trac field Value
Version 7.6.1
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
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