for my $foo (@foo) {                          # 8 fails
    for my $bar (@$foo) {                     # 6 fails
        push @{ $self->{results} },           # 5 works
            {                                 # 3 fails
                baz => foo( $bar->{baz},      # 2 works
                            $bar->{quux}[1] ) # 1 fails
            };                                # 4 works
    }                                         # 7 works
}                                             # 9 works