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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>
21 lines
624 B
Plaintext
21 lines
624 B
Plaintext
error[E0597]: `s` does not live long enough
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--> $DIR/generator_capture_fail.rs:8:17
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LL | let i = {
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| - borrow later stored here
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LL | let s = String::new();
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LL | iter! { || {
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| _________________^
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LL | | yield s.len();
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LL | | for x in 5..10 {
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LL | | yield x * 2;
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LL | | }
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LL | | } }
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| |_________^ borrowed value does not live long enough
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LL | };
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| - `s` dropped here while still borrowed
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error: aborting due to 1 previous error
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For more information about this error, try `rustc --explain E0597`.
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