no warning for div by zero: let x = 1 / false as u8;

[matthiaskrgr]

inlined inside a println!(), I get a warning:

fn main() {
    println!("{}", 1/false as u8);
}

error[E0080]: constant evaluation error
 --> src/main.rs:4:17
  |
4 |     println!("{}", 1/false as u8);
  |                    ^^^^^^^^^^^^^ attempted to do overflowing math
error: aborting due to previous error

however, when I involve a variable

fn main() {
	let x = 1 / false as u8;
	println!("{}", x);
}

there is no warning at all but looking at the generated code it is quite clear that this panics:
https://godbolt.org/g/NQmSFM

[hanna-kruppe]

It warns on current stable, but not on beta and nightly. Might be miri fallout? cc @oli-obk

Curiously, when you take a reference (to trigger promotion to static) you get a hard error on beta and nightly (stable is still a warning). Isn't that a regression?