// MIR for `foo` after built
fn foo(_1: Foo) -> usize {
debug foo => _1;
let mut _0: usize;
let _2: Foo;
let mut _3: isize;
bb0: {
StorageLive(_2);
_2 = move _1;
_3 = discriminant(_2);
_0 = move _3 as usize (IntToInt);
StorageDead(_2);
return;
}