GHC Panic: "AThing evaluated unexpectedly"
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.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.5 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Template Haskell |
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