darcs patch: add withFile and withBinaryFile (#966)

[Ross Paterson]

Thu Oct 26 01:10:44 BST 2006  Ross Paterson <ross at soi.city.ac.uk>
  * add withFile and withBinaryFile (#966)
  
  To be discussed on the libraries list until Thursday 9th November 2006.
  
  These functions are fairly small, but they're worth naming because they
  wrap up a pattern that should be encouraged.
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