rust/tests/ui/borrowck/borrowck-insert-during-each.rs
2023-01-11 09:32:08 +00:00

27 lines
464 B
Rust

use std::collections::HashSet;
struct Foo {
n: HashSet<isize>,
}
impl Foo {
pub fn foo<F>(&mut self, mut fun: F) where F: FnMut(&isize) {
for f in &self.n {
fun(f);
}
}
}
fn bar(f: &mut Foo) {
f.foo(
//~^ ERROR cannot borrow `*f` as mutable
|a| { //~ ERROR closure requires unique access to `f`
f.n.insert(*a);
})
}
fn main() {
let mut f = Foo { n: HashSet::new() };
bar(&mut f);
}