mirror of https://github.com/rust-lang/rust
36 lines
846 B
Rust
36 lines
846 B
Rust
//@ revisions: next old
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//@compile-flags: --edition 2024 -Zunstable-options
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//@[next] compile-flags: -Znext-solver
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//@ run-pass
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#![feature(gen_blocks)]
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fn foo() -> impl Iterator<Item = u32> {
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gen { yield 42; for x in 3..6 { yield x } }
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}
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fn moved() -> impl Iterator<Item = u32> {
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let mut x = "foo".to_string();
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gen move {
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yield 42;
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if x == "foo" { return }
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x.clear();
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for x in 3..6 { yield x }
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}
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}
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fn main() {
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let mut iter = foo();
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assert_eq!(iter.next(), Some(42));
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assert_eq!(iter.next(), Some(3));
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assert_eq!(iter.next(), Some(4));
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assert_eq!(iter.next(), Some(5));
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assert_eq!(iter.next(), None);
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// `gen` blocks are fused
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assert_eq!(iter.next(), None);
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let mut iter = moved();
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assert_eq!(iter.next(), Some(42));
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assert_eq!(iter.next(), None);
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}
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