mirror of https://github.com/rust-lang/rust.git
21 lines
591 B
Rust
21 lines
591 B
Rust
//! The recursive method call yields the opaque type. The
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//! `next` method call then constrains the hidden type to `&mut _`
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//! because `next` takes `&mut self`. We never resolve the inference
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//! variable, but get a type mismatch when comparing `&mut _` with
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//! `std::iter::Empty`.
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//@ revisions: current next
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//@[next] compile-flags: -Znext-solver
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//@[current] check-pass
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fn foo(b: bool) -> impl Iterator<Item = ()> {
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if b {
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foo(false).next().unwrap();
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//[next]~^ type annotations needed
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}
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std::iter::empty()
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//[next]~^ mismatched types
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}
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fn main() {}
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