std::Vec does not have the from_fn method described in the tutorial

[bandrei]

Info located at: http://doc.rust-lang.org/book/tasks.html

// Create a vector of ports, one for each child thread
let rxs = Vec::from_fn(3, |init_val| {
    let (tx, rx) = channel();
    spawn(move || {
        tx.send(some_expensive_computation(init_val));
    });
    rx
});

// Wait on each port, accumulating the results
let result = rxs.iter().fold(0, |accum, rx| accum + rx.recv() );

Looking at the source code in libcollections there doesn't seem to be such a method alltogether.

[steveklabnik]

This would be fixed by #21152

The new way is (0..3).map(f).collect()