#2470: read for StdGen fails for arbitrary string
----------------------------+-----------------------------------------------
Reporter: guest | Owner:
Type: bug | Status: new
Priority: normal | Component: libraries/random
Version: 6.8.3 | Severity: normal
Keywords: StdGen read | Testcase:
Architecture: x86 | Os: Windows
----------------------------+-----------------------------------------------
According to the docs for StdGen:
"In addition, read may be used to map an arbitrary string (not necessarily
one produced by show) onto a value of type StdGen. In general, the read
instance of StdGen has the following properties:
* It guarantees to succeed on any string.
* It guarantees to consume only a finite portion of the string.
* Different argument strings are likely to result in different
results."
Here's what happens on my system:
C:\odm\ghc\lib>ghci
GHCi, version 6.8.3: http://www.haskell.org/ghc/ :? for help
Loading package base ... linking ... done.
Prelude> :mod +System.Random
Prelude System.Random> (read "tasty tofu") :: StdGen
Loading package old-locale-1.0.0.0 ... linking ... done.
Loading package old-time-1.0.0.0 ... linking ... done.
Loading package random-1.0.0.0 ... linking ... done.
*** Exception: Prelude.read: no parse
Prelude System.Random>
You can contact me at [EMAIL PROTECTED] if you need more information.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2470>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler_______________________________________________
Glasgow-haskell-bugs mailing list
Glasgow-haskell-bugs@haskell.org
http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
