Extended slicing

[zzzzz]

Hi all,

Just looking at the Reference Manual Release 2.0 dated Oct 16, 2000 at
the section on 5.3.3 slicings. It appears to me that I should be able
to use an extended slice like follows:

x=range(20)
y=x[3:4,6:10]

However, when I try this on Python '2.0 (#8, Oct 19 2000, 11:30:05)
[MSC 32 bit (Intel)]' I get a traceback error "TypeError: sequence
index must be integer".

Is this feature implemented yet?
Have I misread the definition of slicing?

How do I know it's not implemented?