mirror of https://github.com/rust-lang/rust
33 lines
865 B
Rust
33 lines
865 B
Rust
// Regression test: if we suggest replacing an `impl Trait` argument to an async
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// fn with a named type parameter in order to add bounds, the suggested function
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// signature should be well-formed.
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//
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//@ edition:2018
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trait Foo {
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type Bar;
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fn bar(&self) -> Self::Bar;
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}
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async fn run(_: &(), foo: impl Foo) -> std::io::Result<()> {
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let bar = foo.bar();
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assert_is_send(&bar);
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//~^ ERROR: `<impl Foo as Foo>::Bar` cannot be sent between threads safely
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Ok(())
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}
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// Test our handling of cases where there is a generic parameter list in the
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// source, but only synthetic generic parameters
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async fn run2< >(_: &(), foo: impl Foo) -> std::io::Result<()> {
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let bar = foo.bar();
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assert_is_send(&bar);
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//~^ ERROR: `<impl Foo as Foo>::Bar` cannot be sent between threads safely
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Ok(())
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}
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fn assert_is_send<T: Send>(_: &T) {}
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fn main() {}
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