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#!/usr/bin/perl

...

@_ = ('a' .. 'b');
print for (@_) x= 2;

Can't modify array dereference in repeat (x) ...
Execution of arrX2.pl aborted due to compilation errors.

#!/usr/bin/perl

...
$\ = $/;

print for (@_ = ('a' .. 'b')) x= 2;

2
2

#!/usr/bin/perl

...

(@_ = ('a' .. 'b')) x= 2;
print for @_;

a
b