forlayer: variable _n is not properly set #434
Description
$ vpype repeat 10 circle -l new 0 0 1cm end forlayer eval "print(_i, _n, _lid)" end
0 1 1
1 1 2
2 1 3
3 1 4
4 1 5
5 1 6
6 1 7
7 1 8
8 1 9
9 1 10