[perl #15357] Read & write ops in core.ops are broken

# New Ticket Created by  Simon Glover 
# Please include the string:  [perl #15357]
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# <URL: http://rt.perl.org/rt2/Ticket/Display.html?id=15357 >



 The file descriptors produced by the open op aren't compatible with
 the ones required by the read & write ops (the versions in core.ops)
 so this:

  open I0, "tempfile"
  write I0, 1
  end

 simply fails quietly - the open succeeds (provided that tempfile exists),
 but nothing gets written to the file.

 Simon

• [perl #15357] Read & write ops in core.ops are broken by Simon Glover