Enable volatile values in testing

[Rumata888]

Problem

Currently the following test fails:

#[test(should_fail)]
fn test_u8_underflow(){
let a: u8 = 47;
let b: u8 = 48;
let _ = a - b;
}

Because the underflow constraint is optimised out. So we have to use println to make the result value used instead.

Happy Case

Create a function like volatile to make the value used without printing

Project Impact

Nice-to-have

Impact Context

When we're writing tests for stdlib this is going to be an isse

Workaround

Yes

Workaround Description

Use println

Additional Context

No response

Would you like to submit a PR for this Issue?

None

Support Needs

No response