patch applied (packages/containers): more fine-grained tests

[Ross Paterson]

Fri Jan 14 02:06:42 PST 2011  Ross Paterson <ross at soi.city.ac.uk>
  * more fine-grained tests
  
  Distinguish between whether the key searched for is present or not,
  and the different uses of update and alter.

    M ./benchmarks/Map.hs -30 +42

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=packages/containers;a=darcs_commitdiff;h=20110114100642-b47d3-7d39406d6b01c355621009a0f437f739fc12cadf.gz