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perl -e'for ( 1 ) { my $x = pack "I", $_; }'

perl -e'for my $x ( 1 ) { my $y = pack "I", $x; }'

perl -e'for my $x ( 1 ) { my $x = pack "I", $x; }'

perl -e'for my $x ( my $tmp = 1 ) { $x = pack "I", $x; }'

use feature qw( say );
use experimental qw( refaliasing declared_refs );
...
say $x;        # 1
$x = 2;        # Modification of a read-only value attempted
say $x;