Skip to content

GHCi internal error with runQ [| it |] and _

GHCi gives a GHC internal error with the following input:

:set -XTemplateHaskell
:m + Language.Haskell.TH.Syntax
runQ [| it |]
runQ [| it |]
_

Session:

$ ghci
GHCi, version 8.4.3: http://www.haskell.org/ghc/  :? for help
Prelude> :set -XTemplateHaskell
Prelude> :m + Language.Haskell.TH.Syntax
Prelude Language.Haskell.TH.Syntax> runQ [| it |]
UnboundVarE it
Prelude Language.Haskell.TH.Syntax> runQ [| it |]
VarE Ghci1.it
Prelude Language.Haskell.TH.Syntax> _

<interactive>:1:1: error:
    GHC internal error: ‘Ghci1.it’ is not in scope during type checking, but it passed the renamer
    tcl_env of environment: []
Prelude Language.Haskell.TH.Syntax>
Trac metadata
Trac field Value
Version 8.4.3
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