1 // Regression test for #41697. Using dump-mir was triggering
2 // artificial cycles: during type-checking, we had to get the MIR for
3 // the constant expressions in `[u8; 2]`, which in turn would trigger
4 // an attempt to get the def-path, which in turn would request the
5 // types of the impl, which would trigger a cycle. We suppressed this
6 // cycle now by forcing mir-dump to avoid asking for types of an impl.
8 #![feature(rustc_attrs)]
13 fn get(&self) -> [u8; 2];
16 impl Foo for [u8; 2] {
17 fn get(&self) -> [u8; 2] {
22 struct Bar<T: ?Sized>(T);
24 fn unsize_fat_ptr<'a>(x: &'a Bar<Foo + Send + 'a>) -> &'a Bar<Foo + 'a> {
28 fn unsize_nested_fat_ptr(x: Arc<Foo + Send>) -> Arc<Foo> {
33 let x: Box<Bar<Foo + Send>> = Box::new(Bar([1,2]));
34 assert_eq!(unsize_fat_ptr(&*x).0.get(), [1, 2]);
36 let x: Arc<Foo + Send> = Arc::new([3, 4]);
37 assert_eq!(unsize_nested_fat_ptr(x).get(), [3, 4]);