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