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  • Glasgow Haskell Compiler
  • GHCGHC
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  • #3990

Closed
Open
Created Apr 14, 2010 by rl@cse.unsw.edu.au@trac-rl

UNPACK doesn't unbox data families

Here is an example:

data family Complex a
data instance Complex Double = CD {-# UNPACK #-} !Double
                                  {-# UNPACK #-} !Double

data T = T {-# UNPACK #-} !(Complex Double)

We would like T to just store two Double# but that doesn't happen. Contrast this with

data Complex_Double = CD {-# UNPACK #-} !Double
                         {-# UNPACK #-} !Double

data T = T {-# UNPACK #-} !Complex_Double
Trac metadata
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Version 6.13
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
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