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GHC panic usinig HList and Lens
This bug might have been fixed in GHC 7.8.2 but I haven't been able to test it. Some packages required to reproduce the bug are broken under 7.8.*.
GHC 'panic' whilst trying to compile the following. Strangely, removing doing the last line of code 'manually' in ghci works.
{-# LANGUAGE TypeFamilies, DataKinds, PolyKinds, TypeOperators #-}
{-# LANGUAGE NoMonomorphismRestriction #-}
module Database.Harehouse.SQLFragment where
import Data.HList
import Control.Lens hiding(from)
x = hLens' (Label :: Label "x")Note. I'm using HList-0.3.4.1 and lens-4.1.2.1. I think it wasn't working with lens 4.2 either, but since I tried to install ghc 7.8.2 I haven't be able to reinstall lens 4.2. (cabal hell).
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.6.3 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
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| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |