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#!/usr/bin/perl -T ... foreach my $key (keys %hash) { warn is_tainted($key); }
tainted at ./taint_test.pl line 19, <FILE> line 1. tainted at ./taint_test.pl line 19, <FILE> line 2. ... not tainted at ./taint_test.pl line 25. not tainted at ./taint_test.pl line 25. not tainted at ./taint_test.pl line 25.