$ perl -le 'eval q[exit $?0]; print $@'
Number found where operator expected at (eval 1) line 1, near "$?0"
        (Missing operator before 0?)
syntax error at (eval 1) line 1, near "$?0"

##</code><code>##

$ perl -le 'eval q[exec env LANG=C $0 ${1+"$@"}]; print $@;'
Can't call method "C" without a package or object reference at (eval 1) line 1.