mirror of https://github.com/rust-lang/rust
20 lines
638 B
Rust
20 lines
638 B
Rust
#[deny(single_use_lifetimes)]
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//@ edition:2018
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//@ check-pass
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// Prior to the fix, the compiler complained that the 'a lifetime was only used
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// once. This was obviously wrong since the lifetime is used twice: For the s3
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// parameter and the return type. The issue was caused by the compiler
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// desugaring the async function into a coroutine that uses only a single
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// lifetime, which then the validator complained about becauase of the
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// single_use_lifetimes constraints.
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async fn bar<'a>(s1: String, s2: &'_ str, s3: &'a str) -> &'a str {
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s3
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}
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fn foo<'a>(s1: String, s2: &'_ str, s3: &'a str) -> &'a str {
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s3
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}
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fn main() {}
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