ghc 6.10.4_2 System.Random busted for floats/doubles on Snow Leopard

[waterson@…]

The System.Random functions (randomIO, randomRIO), when used with Double of Float, seem to consistently return Infinity. The expectation being that these would, of course, return random floating point numbers.

For example,

~$ ghci
GHCi, version 6.10.4: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer ... linking ... done.
Loading package base ... linking ... done.
Prelude> :m +System.Random
Prelude System.Random> randomIO :: IO Double
Loading package old-locale-1.0.0.1 ... linking ... done.
Loading package old-time-1.0.0.2 ... linking ... done.
Loading package random-1.0.0.1 ... linking ... done.
Infinity
Prelude System.Random> randomIO :: IO Float
Infinity
Prelude System.Random> randomRIO (0.0 :: Double, 1.0)
Infinity
Prelude System.Random> :q
Leaving GHCi.
~$ 

Integers do not seem to be affected.

[jmroot (Joshua Root)]

Please remember to cc the maintainer.

[raimue (Rainer Müller)]

Port abandoned, #35561.

[neverpanic (Clemens Lang)]

This ticket is obsolete, since GHC has been updated since.