patch applied (packages/base): Add comments about double bounds-checking, and fast paths for rectangular arrays

[Simon Peyton Jones]

Fri Dec 18 08:56:55 PST 2009  simonpj at microsoft.com
  * Add comments about double bounds-checking, and fast paths for rectangular arrays
  Ignore-this: ea0849419dc00927aba4bd410b1cc58d
  
  See Note [Double bounds-checking of index values] for the details.
  
  The fast paths omit the doubled checks for cases we know about

    M ./GHC/Arr.lhs -1 +43

View patch online:
http://darcs.haskell.org/packages/base/_darcs/patches/20091218165655-1287e-f7e358831a83a80c9375892154390f314d2b3130.gz