"git@developer.sourcefind.cn:gaoqiong/composable_kernel.git" did not exist on "9d6938ff12cb45b81a370c9eb83e1d52048a4e08"
Specialized the overloaded [] operator for int/unsigned, and added a size() function, so that you can iterate through a sequence node like a vector.
Fixed a silly bug in the simple key pushing (queues are FIFO!).
Will be completely wiped, I think, in favor of a Scanner (to tokens), then Parser mechanism.