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There were three issues previously: * The self argument was pinned, despite Iterator::next taking an unpinned mutable reference. * A resume argument was passed, despite Iterator::next not having one. * The return value was CoroutineState<Item, ()> rather than Option<Item> While these things just so happened to work with the LLVM backend, cg_clif does much stricter checks when trying to assign a value to a place. In addition it can't handle the mismatch between the amount of arguments specified by the FnAbi and the FnSig.
37 lines
983 B
Rust
37 lines
983 B
Rust
// Copied from https://github.com/rust-lang/rust/blob/46455dc65069387f2dc46612f13fd45452ab301a/tests/ui/coroutine/gen_block_iterate.rs
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// revisions: next old
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//compile-flags: --edition 2024 -Zunstable-options
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//[next] compile-flags: -Ztrait-solver=next
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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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