id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,os,architecture,failure,difficulty,testcase,blockedby,blocking,related
5968,"GHC Panic: ""AThing evaluated unexpectedly""",goldfire,,"Using an unmodified build from March 13, 2012, I compiled the following:

{{{
{-# LANGUAGE TemplateHaskell #-}
data Bar a = Bar $( [t| a |] )
}}}

I got the following panic:

{{{
ghc-stage2: panic! (the 'impossible' happened)
  (GHC version 7.5.20120313 for x86_64-unknown-linux):
        AThing evaluated unexpectedly tcTyVar a{tv aKM}
}}}

I observed this exact same panic on a modified 3/25/12 build.",bug,closed,normal,,Template Haskell,7.5,fixed,TemplateHaskell,,Unknown/Multiple,Unknown/Multiple,None/Unknown,Unknown,th/T5968,,,