not either, because the scope of $x is confined to the do block: 

use strict; use warnings;

sub f{0} sub g{1}

if (do {my $x = f(); $x and g($x)}) {
    print "cheerful: $x\n";
}
__END__
Global symbol "$x" requires explicit package name at scope.pl line 6.

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In reply to Re^2: scope of my $x in if statements by shmem
in thread scope of my $x in if statements by perl5ever

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