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//@ edition: 2021
fn polarity() -> impl Sized + ?use<> {}
//~^ ERROR expected identifier, found keyword `use`
//~| ERROR cannot find trait `r#use` in this scope
fn asyncness() -> impl Sized + async use<> {}
//~^ ERROR expected identifier, found keyword `use`
//~| ERROR cannot find trait `r#use` in this scope
//~| ERROR `async` trait bounds are unstable
fn constness() -> impl Sized + const use<> {}
//~^ ERROR expected identifier, found keyword `use`
//~| ERROR cannot find trait `r#use` in this scope
//~| ERROR const trait impls are experimental
fn binder() -> impl Sized + for<'a> use<> {}
//~^ ERROR expected identifier, found keyword `use`
//~| ERROR cannot find trait `r#use` in this scope
fn main() {}
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