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  • #15433

Closed
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Created Jul 23, 2018 by Krzysztof Gogolewski@monoidalDeveloper

Internal error with PartialTypeSignatures and TH

File:

{-# LANGUAGE TemplateHaskell #-}
type T = $([t| _ |])

gives a bad error message in 8.4 and HEAD:

    • GHC internal error: ‘_’ is not in scope during type checking, but it passed the renamer
      tcl_env of environment: [r1sn :-> ATcTyCon T :: k0]
    • In the type ‘(_)’
      In the type declaration for ‘T’
Trac metadata
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Version 8.4.3
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
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