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# foo.t
use strict;
...
# Note: I want a warning here:
cmp_ok(add(1000,1000), q{==}, 2000, q{Expect 1000+1000=2000});
__END__

$ prove foo.t
foo......1/? [WARN] 2008/04/02 11:26:41 main::add foo.pl:20 - possible
+ overflow
...
All tests successful.
Files=1, Tests=8,  1 wallclock secs ( 0.01 usr  0.00 sys +  0.08 cusr 
+ 0.01 csys =  0.10 CPU)
Result: PASS