type hole in hs-boot file triggers GHC internal error
Put each line in a separate file, the last one is B.hs-boot
module A where { import {-# SOURCE #-} B }
module B where { }
module B where { data T a ; foo :: T _ }
then
$ ghci A.hs
GHCi, version 8.6.3: http://www.haskell.org/ghc/ :? for help
[1 of 3] Compiling B[boot] ( B.hs-boot, interpreted )
B.hs-boot:1:38: error:
• GHC internal error: ‘_’ is not in scope during type checking, but it passed the renamer
tcl_env of environment: []
• In the first argument of ‘T’, namely ‘_’
In the type signature: foo :: T _
|
1 | module B where { data T a ; foo :: T _ }
| ^
I know the program is invalid (the hole has no valid instance) but still it should not produce an internal error?
Trac metadata
Trac field | Value |
---|---|
Version | 8.6.3 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |