Struct creation by element insertion failed.
@bruno.jofret)
Reported by Bruno JOFRET (Creating a complex structure with multiple hierarchy level and size may fail.
Example :
opencv_storage.haarcascade_alt.stages(1).trees(1).value(1).feature.rects(1).value = [3 7 14 4 -1.];
opencv_storage.haarcascade_alt.stages(1).trees(2).value(1).feature.rects(1).value = [1 2 18 4 -1.];
Will fail with : !--error 21
Invalid index.