36 lines
641 B
Rust
36 lines
641 B
Rust
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#![feature(return_position_impl_trait_in_trait)]
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pub trait Trait {
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fn create() -> impl Iterator<Item = u64> {
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std::iter::empty()
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}
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}
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pub struct Basic;
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pub struct Intermediate;
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pub struct Advanced;
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impl Trait for Basic {
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// method provided by the trait
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}
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impl Trait for Intermediate {
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fn create() -> std::ops::Range<u64> { // concrete return type
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0..1
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}
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}
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impl Trait for Advanced {
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fn create() -> impl Iterator<Item = u64> { // opaque return type
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std::iter::repeat(0)
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}
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}
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// Regression test for issue #113929:
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pub trait Def {
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fn def<T>() -> impl Default {}
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}
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impl Def for () {}
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