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  • Glasgow Haskell Compiler
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  • #12411

Closed
Open
Created Jul 19, 2016 by Icelandjack@IcelandjackReporter

GHC panic on TypeApplications + TemplateHaskell

This fails

$ ghci -XTemplateHaskell -ignore-dot-ghci
GHCi, version 8.0.1: http://www.haskell.org/ghc/  :? for help
Prelude> import Control.Lens
Prelude Control.Lens> data A = B { _int :: Int }
Prelude Control.Lens> pure @Q []; makeLenses ''A
ghc: panic! (the 'impossible' happened)
(GHC version 8.0.1 for x86_64-unknown-linux):
tcMonoExpr _

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

Prelude Control.Lens>

sorry, don't have time for more detail

Trac metadata
Trac field Value
Version 8.0.1
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
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