!0u32/2 gives “error: attempted to divide with overflow in a constant expression [E0020]” #23968
Description
println!("{}", !0u32); // 4294967295
println!("{}", !0u32/2); // error: attempted to divide with overflow in a constant expression [E0020]
const A: u32 = !0;
println!("{}", A/2); // error: attempted to divide with overflow in a constant expression [E0020]
let a: u32 = !0;
println!("{}", a/2); // 2147483647
const B: u32 = 4294967295;
println!("{}", A == B); // true
println!("{}", B/2); // 2147483647This affects the test suites for the num and rand crates.
$ rustc --version
rustc 1.0.0-dev (built 2015-04-02)
$ dpkg-query -W rust-nightly
rust-nightly 201504020407~2e3b0c0~vivid