4 #![allow(unused_variables)]
5 // Type ascription doesn't lead to unsoundness
7 #![feature(type_ascription)]
11 const C1: u8 = type_ascribe!(10, u8);
12 const C2: [u8; type_ascribe!(1, usize)] = [1];
19 assert_eq!(type_ascribe!(C1.into(), i32), 10);
22 let s = S { a: type_ascribe!(10, u8) };
23 let arr = &[1u8, 2, 3];
25 let mut v = type_ascribe!(arr.iter().cloned().collect(), Vec<_>);
27 assert_eq!(v, [1, 2, 3, 4]);
29 let a = type_ascribe!(1, u8);
30 let b = type_ascribe!(a.into(), u16);
31 assert_eq!(v[type_ascribe!(a.into(), usize)], 2);
32 assert_eq!(mem::size_of_val(&a), 1);
33 assert_eq!(mem::size_of_val(&b), 2);
34 assert_eq!(b, type_ascribe!(1, u16));
36 let mut v = Vec::new();
37 type_ascribe!(v, Vec<u8>) = vec![1, 2, 3]; // Place expression type ascription
38 assert_eq!(v, [1u8, 2, 3]);