Fixed fragment allocation in the native functions and added some list and buffer
operations, extending the buffer class. Eventually, buffer and list may be
combined in some way.
1a=4 2 3deff(x): 4ifnotx: 5defg(y): 6returnx,y,a 7returng# UnboundLocalError: not defined if x is true 8 9result=f(1)(2) 10assertresult==(1,2,4)