[rust-dev] Iterators, lists, vectors

[Rust]

Hi,
 
i wonder how we will "replicate" Haskell's lazy lists.
 
For example: `str::split` splits a string and returns a list/vector of
sub-strings.
But maybe we don't want to duplicate those sub-strings in memory and we don't
want to create such an intermediate list/vector
if we just plan to iterate over it. 
 
We could add a `str::split_iter` which calls a block instead.
But then we'd need to duplicate every function: one returning a list/vector, and
the other taking a block.
=> interface explosion 
 
Am i missing something (e.g. that strings are immutable and the list of strings
are just "pointers" to the orignal string)?
Do we need lazy sequences?
Any other idea?
 
Bye,
Lenny 
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