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#![feature(unboxed_closures)]
trait A {
fn a() where Self: Sized;
}
mod a {
use crate::A;
pub fn foo<F: FnOnce<()>>() where F::Output: A {
F::Output::a()
}
pub fn bar<F: FnOnce() -> R, R: ?Sized>() {}
pub fn baz<F: FnOnce<()>>() where F::Output: A, F::Output: Sized {
F::Output::a()
}
}
mod b {
use crate::A;
pub fn foo<F: Fn<()>>() where F::Output: A {
F::Output::a()
}
pub fn bar<F: Fn() -> R, R: ?Sized>() {}
pub fn baz<F: Fn<()>>() where F::Output: A, F::Output: Sized {
F::Output::a()
}
}
mod c {
use crate::A;
pub fn foo<F: FnMut<()>>() where F::Output: A {
F::Output::a()
}
pub fn bar<F: FnMut() -> R, R: ?Sized>() {}
pub fn baz<F: FnMut<()>>() where F::Output: A, F::Output: Sized {
F::Output::a()
}
}
impl A for Box<dyn A> {
fn a() {}
}
fn main() {
a::foo::<fn() -> dyn A>(); //~ ERROR E0277
a::bar::<fn() -> dyn A, _>(); //~ ERROR E0277
a::baz::<fn() -> dyn A>(); //~ ERROR E0277
a::foo::<fn() -> Box<dyn A>>(); // ok
a::bar::<fn() -> Box<dyn A>, _>(); // ok
a::baz::<fn() -> Box<dyn A>>(); // ok
b::foo::<fn() -> dyn A>(); //~ ERROR E0277
b::bar::<fn() -> dyn A, _>(); //~ ERROR E0277
b::baz::<fn() -> dyn A>(); //~ ERROR E0277
b::foo::<fn() -> Box<dyn A>>(); // ok
b::bar::<fn() -> Box<dyn A>, _>(); // ok
b::baz::<fn() -> Box<dyn A>>(); // ok
c::foo::<fn() -> dyn A>(); //~ ERROR E0277
c::bar::<fn() -> dyn A, _>(); //~ ERROR E0277
c::baz::<fn() -> dyn A>(); //~ ERROR E0277
c::foo::<fn() -> Box<dyn A>>(); // ok
c::bar::<fn() -> Box<dyn A>, _>(); // ok
c::baz::<fn() -> Box<dyn A>>(); // ok
}
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