use feature qw[ say ];

use Safe;

# works here
say "Hello!";

my $cft = Safe->new;
# allow all opcodes
$cft->deny_only();

# doesn't work here (expected result)
$cft->reval( 'say "Hello Again!"' );

# explicit load of feature, but doesn't work (unexpected result)
$cft->reval( 'use feature qw[ say ]; say "Hello Again! 2"' );

##</code><code>##

Hello!
String found where operator expected at (eval 5) line 1, near "say "Hello Again!""
	(Do you need to predeclare say?)
String found where operator expected at (eval 7) line 1, near "say "Hello Again! 2""
	(Do you need to predeclare say?)