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// Here we check that it is allowed to lend out an element of a
// (locally rooted) mutable, unique vector, and that we then prevent
// modifications to the contents.
fn takes_imm_elt<F>(_v: &isize, f: F) where F: FnOnce() {
f();
}
fn has_mut_vec_and_does_not_try_to_change_it() {
let mut v: Vec<isize> = vec![1, 2, 3];
takes_imm_elt(&v[0], || {})
}
fn has_mut_vec_but_tries_to_change_it() {
let mut v: Vec<isize> = vec![1, 2, 3];
takes_imm_elt(
&v[0],
|| { //~ ERROR cannot borrow `v` as mutable
v[1] = 4;
})
}
fn main() {
}
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