// run-pass #![feature(const_str_len, const_str_as_bytes)] const S: &str = "foo"; pub const B: &[u8] = S.as_bytes(); pub fn foo() -> [u8; S.len()] { let mut buf = [0; S.len()]; for (i, &c) in S.as_bytes().iter().enumerate() { buf[i] = c; } buf } fn main() { assert_eq!(&foo()[..], b"foo"); assert_eq!(foo().len(), S.len()); const LEN: usize = S.len(); assert_eq!(LEN, S.len()); assert_eq!(B, foo()); assert_eq!(B, b"foo"); }