Here is the map example from the tutorial,
http://static.rust-lang.org/doc/master/tutorial.html#generics ,
fn map<T, U>(vector: &[T], function: &fn(v: &T) -> U) -> ~[U] {
let mut accumulator = ~[];
for element in vector.iter() {
accumulator.push(function(element));
}
return accumulator;
}
It compiles even if the Clone trait is not specified for U and the
push is defined as:
fn push(&mut self, t: T);
which I suppose implies a copy operation for T. So why the Clone trait
is not necessary here for U?
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