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