rust/src/test/compile-fail/borrowck-lend-args.rs

fn borrow(_v: &int) {}

fn borrow_from_arg_imm_ref(&&v: ~int) {
    borrow(v);
}

fn borrow_from_arg_mut_ref(&v: ~int) {
    borrow(v); //~ ERROR illegal borrow unless pure: creating immutable alias to aliasable, mutable memory
    //~^ NOTE impure due to access to impure function
}

fn borrow_from_arg_move(-v: ~int) {
    borrow(v);
}

fn borrow_from_arg_copy(+v: ~int) {
    borrow(v);
}

fn borrow_from_arg_val(++v: ~int) {
    borrow(v);
}

fn main() {
}