#5642: Deriving Generic of a big type takes a long time and lots of space
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Reporter: basvandijk | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.2.1 | Keywords:
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: Compile-time performance bug
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Comment(by clintm):
Came to report this sort of thing too. I can't actually get this code to
completely run as my machine runs out of memory (12g) almost immediately.
{{{
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE UndecidableInstances #-}
module Main where
import GHC.Generics
data User = User { name :: String
, password :: String }
deriving Generic
instance (Show User) => Show (User)
main :: IO ()
main = do
let a = User "gurn" "secret"
putStrLn $ show a
return ()
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5642#comment:2>
GHC <http://www.haskell.org/ghc/>
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