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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>
42 lines
1.3 KiB
Plaintext
42 lines
1.3 KiB
Plaintext
error[E0658]: yield syntax is experimental
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--> $DIR/feature-gate-yield-expr.rs:5:5
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LL | yield ();
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| ^^^^^^^^
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= note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
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= help: add `#![feature(yield_expr)]` to the crate attributes to enable
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= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
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error[E0658]: yield syntax is experimental
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--> $DIR/feature-gate-yield-expr.rs:5:5
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LL | yield ();
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| ^^^^^^^^
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= note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
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= help: add `#![feature(yield_expr)]` to the crate attributes to enable
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= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
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error: `yield` can only be used in `#[coroutine]` closures, or `gen` blocks
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--> $DIR/feature-gate-yield-expr.rs:5:5
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LL | yield ();
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| ^^^^^^^^
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help: use `#[coroutine]` to make this closure a coroutine
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LL | #[coroutine] fn main() {
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| ++++++++++++
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error[E0627]: yield expression outside of coroutine literal
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--> $DIR/feature-gate-yield-expr.rs:5:5
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LL | yield ();
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| ^^^^^^^^
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error: aborting due to 4 previous errors
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Some errors have detailed explanations: E0627, E0658.
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For more information about an error, try `rustc --explain E0627`.
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