The eval number changes quite often, but not the line number, so I thnk that means the same line of the same eval'ed code is failing.

How do I track down where the eval is happening?

#!perl -w
use Carp;
local $SIG{__WARN__} = \&Carp::cluck;
sub foo {
    my($x, $y) = @_;
    return eval '$x+$y';
}
print foo(5);   # should get 2 arguments;
[download]

Use of uninitialized value in addition (+) at (eval 1) line 1.
    eval '$x+$y
;' called at test.pl line 6
    main::foo(5) called at test.pl line 8
5
[download]

p.s. For some reason unclear to me, I get no output using \&Carp::confess. Any hints on why are welcomed.