Uberi/ahkbook — comment on commit bf0b3c9341055056913c0417ad3decb9ddbb61ba
File: en/_posts/2011-11-12-Structures.markdown line 41
By maul-esel:

It should be noted this is available in AHK_L, AHK v2 and AHK_H (v2), but not in AHK classic.