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  1. or download this
    >perl -E '$x=undef; $y=$x // warn "RHS evaluated"; say $y'
RHS evaluated at -e line 1.
...
    /usr/lib64/perl5/site_perl
    /usr/lib64/perl5/vendor_perl
    .
  2. or download this
    C:\>perl -E "$x=undef; $y=$x // warn 'RHS evaluated'; say $y"
RHS evaluated at -e line 1.
...
    .

C:\>