/usr/lib/hugs/packages/base/System/Mem/StableName.hs is in libhugs-base-bundled 98.200609.21-5.4+b3.
This file is owned by root:root, with mode 0o644.
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-- |
-- Module : System.Mem.StableName
-- Copyright : (c) The University of Glasgow 2001
-- License : BSD-style (see the file libraries/base/LICENSE)
--
-- Maintainer : libraries@haskell.org
-- Stability : experimental
-- Portability : non-portable
--
-- Stable names are a way of performing fast (O(1)), not-quite-exact
-- comparison between objects.
--
-- Stable names solve the following problem: suppose you want to build
-- a hash table with Haskell objects as keys, but you want to use
-- pointer equality for comparison; maybe because the keys are large
-- and hashing would be slow, or perhaps because the keys are infinite
-- in size. We can\'t build a hash table using the address of the
-- object as the key, because objects get moved around by the garbage
-- collector, meaning a re-hash would be necessary after every garbage
-- collection.
--
-------------------------------------------------------------------------------
module System.Mem.StableName (
-- * Stable Names
StableName,
makeStableName,
hashStableName,
) where
import Prelude
import Data.Typeable
import Hugs.Stable
stableNameTc = mkTyCon "StableName"; instance Typeable1 StableName where { typeOf1 _ = mkTyConApp stableNameTc [] }; instance Typeable a => Typeable (StableName a) where { typeOf = typeOfDefault }
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