floating point literals

[Simon Peyton-Jones]

Right the Lex library is fixed now, I believe.  Thanks to Koen for
improving the ReadP combinator library, the code is cleaner too.

Simon

|  -----Original Message-----
|  From: Simon Marlow [mailto:simonmar at microsoft.com]
|  Sent: 19 March 2003 09:17
|  To: Dean Herington
|  Cc: Ross Paterson; glasgow-haskell-bugs at haskell.org
|  
|  
|  > Simon Marlow wrote:
|  >
|  > > > On Mon, Mar 17, 2003 at 10:33:47AM +0000, Ross Paterson wrote:
|  > > > > GHC doesn't recognize literals like 9e2, and nor does lex.
|  > > >
|  > > > Correction:
|  > > > GHC doesn't recognize 9e2
|  > > > lex is confused by 0xy, 0oy, 9e+y and 9.0e+y
|  > >
|  > > Fixed GHC, I'll leave lex to someone more familiar with the
code...
|  > >
|  > > Cheers,
|  > >         Simon
|  >
|  > Forgive me if I'm confused, but I thought "9e2" was supposed to be
|  > parsed as two lexemes, "9" and "e2".
|  
|  This changed in the revised version of Haskell 98.  I hadn't noticed,
|  hence GHC was still parsing the old H98 syntax.
|  
|  The change dates back to November 2001, and is listed on Simon's
Errata
|  page, here:
|  
|
http://research.microsoft.com/Users/simonpj/haskell98-revised/haskell98-
|  bugs.html
|  
|  Cheers,
|  	Simon
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