src/test/ui/consts/const-eval/const-eval-span.rs

// Check that error in constant evaluation of enum discriminant
// provides the context for what caused the evaluation.

struct S(i32);

const CONSTANT: S = S(0);

enum E {
    V = CONSTANT,
    //~^ ERROR mismatched types
    //~| expected isize, found struct `S`
    //~|         found type `S`
}

fn main() {}