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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>
31 lines
667 B
Rust
31 lines
667 B
Rust
//@ run-pass
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#![feature(iter_macro, yield_expr)]
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// This test creates an iterator that captures a reference and ensure that doesn't force the
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// iterator to become lending.
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use std::iter::iter;
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fn main() {
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let s = "foo".to_string();
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let f = iter! { || {
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for c in s.chars() {
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yield c;
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}
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}};
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let mut i = f();
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let mut j = f();
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assert_eq!(i.next(), Some('f'));
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assert_eq!(i.next(), Some('o'));
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assert_eq!(i.next(), Some('o'));
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assert_eq!(i.next(), None);
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assert_eq!(j.next(), Some('f'));
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assert_eq!(j.next(), Some('o'));
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assert_eq!(j.next(), Some('o'));
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assert_eq!(j.next(), None);
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}
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