Rust errors W/generics

CODE:
fn map<T, U>(v: [T], f: fn(T) -> U) -> [U] {
    let mut acc = [];
    for v.each {|elt| acc += [f(elt)]; }
    acc
}

ERRORS:
arguments.rs:17:8: 17:14 error: attempted access of field each on type ['a], but no public field or method with that name was found
arguments.rs:17     for v.each {|elt| acc += [f(elt)]; }
                        ^~~~~~
arguments.rs:17:8: 17:40 error: the type of this value must be known in this context
arguments.rs:17     for v.each {|elt| acc += [f(elt)]; }
                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~