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#!/usr/bin/perl
                                                                      
+                     
...
  warn "READLINE\n";
  return "line\n";
}

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TIEHANDLE: TieTest=HASH(0x80fcacc)
Use of uninitialized value in <HANDLE> at tietest.pl line 14.
readline() on unopened filehandle at tietest.pl line 14.
Use of uninitialized value in print at tietest.pl line 14.
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