ICE: assert! on Non Boolean

[nixpulvis]

Running the following yields an unhelpful error message, and ICE in the span printing.

fn main() {
    assert!(Ok(1));
}

With error

error: cannot apply unary operator `!` to type `core::result::Result<_, _>`

A potential solution could be if $cond { } else { panic! ... }

Either way there is some problem with span printing on this bad use of assert!.

[arielb1]

No ICE in the span printing on nightly.