5fbdfc3e10
This adds an `iter!` macro that can be used to create movable generators. This also adds a yield_expr feature so the `yield` keyword can be used within iter! macro bodies. This was needed because several unstable features each need `yield` expressions, so this allows us to stabilize them separately from any individual feature. Co-authored-by: Oli Scherer <github35764891676564198441@oli-obk.de> Co-authored-by: Jieyou Xu <jieyouxu@outlook.com> Co-authored-by: Travis Cross <tc@traviscross.com>
27 lines
691 B
Rust
27 lines
691 B
Rust
// This test exercises lending behavior for iterator closures which is not yet supported.
|
|
|
|
#![feature(iter_macro, yield_expr)]
|
|
|
|
use std::iter::iter;
|
|
|
|
fn main() {
|
|
let f = {
|
|
let s = "foo".to_string();
|
|
iter! { move || {
|
|
for c in s.chars() {
|
|
yield c;
|
|
}
|
|
}}
|
|
};
|
|
let mut i = f();
|
|
assert_eq!(i.next(), Some('f'));
|
|
assert_eq!(i.next(), Some('o'));
|
|
assert_eq!(i.next(), Some('o'));
|
|
assert_eq!(i.next(), None);
|
|
let mut i = f(); //~ ERROR use of moved value: `f`
|
|
assert_eq!(i.next(), Some('f'));
|
|
assert_eq!(i.next(), Some('o'));
|
|
assert_eq!(i.next(), Some('o'));
|
|
assert_eq!(i.next(), None);
|
|
}
|