Bugs item #643878, was opened at 2002-11-26 01:12
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Category: Prelude
Group: 5.04.1
Status: Open
Resolution: None
Priority: 5
Submitted By: Mike Gunter (magunter)
Assigned to: Nobody/Anonymous (nobody)
Summary: sortBy not stable
Initial Comment:
The library report requires that sortBy be stable. In
5.04.1 it isn't:
gunter.philco.com[1995]$ ghci
___ ___ _
/ _ \ /\ /\/ __(_)
/ /_\// /_/ / / | | GHC Interactive, version
5.04, for Haskell 98.
/ /_\/ __ / /___| | http://www.haskell.org/ghc/
\____/\/ /_/\____/|_| Type :? for help.
Loading package base ... linking ... done.
Loading package haskell98 ... linking ... done.
Prelude> List.sortBy (\ (_,a) (_,b) -> compare a b) $
zip [0..] [100,0,0,0]
[(3,0),(2,0),(1,0),(0,100)]
. In 5.02.3, it was stable:
c966553-A[2314]$ ghci
___ ___ _
/ _ \ /\ /\/ __(_)
/ /_\// /_/ / / | | GHC Interactive, version
5.02.3, for Haskell 98.
/ /_\/ __ / /___| | http://www.haskell.org/ghc/
\____/\/ /_/\____/|_| Type :? for help.
Loading package std ... linking ... done.
Prelude> List.sortBy (\ (_,a) (_,b) -> compare a b) $
zip [0..] [100,0,0,0]
[(1,0),(2,0),(3,0),(0,100)]
----------------------------------------------------------------------
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