What odd code - the first eval will always produce an error e.g 
$ 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"

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So the second eval will never get used, and even if it did, that would also bail out (although, rather frighteningly, it's valid perl code; indirect object syntax is to blame :/) e.g 
$ 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.

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From here it looks like some seriously fruity mix of shell and perl that can never work. However your second concotion looks far more likely to succeed.
HTH

_________
broquaint

update: tidied up second code example and added side note that it actually compiles (ick)

In reply to Re: understanding eval in HPOJ by broquaint
in thread understanding eval in HPOJ by GhodMode

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