Added tests.

src/test/run-pass/issues/issue-24010.rs

@@ -0,0 +1,22 @@
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+trait Foo: Fn(i32) -> i32 + Send {}
+
+impl<T: ?Sized + Fn(i32) -> i32 + Send> Foo for T {}
+
+fn wants_foo(f: Box<Foo>) -> i32 {
+    f(42)
+}
+
+fn main() {
+    let f = Box::new(|x| x);
+    assert_eq!(wants_foo(f), 42);
+}

src/test/run-pass/traits/trait-alias-objects.rs

@@ -21,7 +21,6 @@ pub fn main() {
     let b = Box::new(456) as Box<dyn Foo>;
     assert!(*b == 456);
 
-    // FIXME(alexreg): associated type should be gotten from trait alias definition
-    // let c: &dyn I32Iterator = &vec![123].into_iter();
-    // assert_eq!(c.next(), Some(123));
+    let c: &mut dyn I32Iterator<Item = u32> = &mut vec![123].into_iter();
+    assert_eq!(c.next(), Some(123));
 }