mirror of https://github.com/rust-lang/rust.git
34 lines
876 B
Rust
34 lines
876 B
Rust
// build-fail
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// compile-flags: -Zinline-mir=no
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// error-pattern: overflow evaluating the requirement `<std::iter::Empty<()> as Iterator>::Item == ()`
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// error-pattern: function cannot return without recursing
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// normalize-stderr-test: "long-type-\d+" -> "long-type-hash"
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// ignore-compare-mode-next-solver (hangs)
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// Regression test for #91949.
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// This hanged *forever* on 1.56, fixed by #90423.
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#![recursion_limit = "256"]
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struct Wrapped<T>(T);
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struct IteratorOfWrapped<T, I: Iterator<Item = T>>(I);
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impl<T, I: Iterator<Item = T>> Iterator for IteratorOfWrapped<T, I> {
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type Item = Wrapped<T>;
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fn next(&mut self) -> Option<Wrapped<T>> {
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self.0.next().map(Wrapped)
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}
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}
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fn recurse<T>(elements: T) -> Vec<char>
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where
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T: Iterator<Item = ()>,
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{
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recurse(IteratorOfWrapped(elements).map(|t| t.0))
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}
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fn main() {
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recurse(std::iter::empty());
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}
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