$ perl -we '@bar = (42, 5); (@bar) = (@bar) x 5; warn "(@bar)";'
(42 5 42 5 42 5 42 5 42 5) at -e line 1.
$ perl -we '@bar = (42, 5); (@bar) x= 5; warn "(@bar)";'
Can't modify array dereference in repeat (x) at -e line 1, near "5;"
Execution of -e aborted due to compilation errors.
$