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my $s = 'The quick brown fox jumps over the lazy dog';
print ${ \substr($s, $_, 1) } for 0 .. length($s)-1;
# Output
The quick brown fox jumps over the lazy dog

my @refs;
push @r, \substr($s, $_, 1) for 0 .. length($s) -1;
print $$_ for @refs;
# Output
ggggggggggggggggggggggggggggggggggggggggggg

print @refs;
# Output
LVALUE(0x1bd5270) LVALUE(0x1bd5270) LVALUE(0x1bd5270) LVALUE(0x1bd5270
+) LVALUE(0x1bd5270) LVALUE(0x1bd5270) ...