// MIR for `main` after built

| User Type Annotations
| 0: user_ty: Canonical { value: Ty(Void), max_universe: U0, variables: [], defining_opaque_types: [] }, span: $DIR/issue_72181_1.rs:17:12: 17:16, inferred_ty: Void
| 1: user_ty: Canonical { value: Ty(Void), max_universe: U0, variables: [], defining_opaque_types: [] }, span: $DIR/issue_72181_1.rs:17:12: 17:16, inferred_ty: Void
|
fn main() -> () {
    let mut _0: ();
    let mut _1: !;
    let _2: Void as UserTypeProjection { base: UserType(0), projs: [] };
    let mut _3: ();
    let _4: !;
    let mut _5: Void;
    scope 1 {
        debug v => _2;
    }

    bb0: {
        StorageLive(_2);
        StorageLive(_3);
        _3 = ();
        _2 = transmute::<(), Void>(move _3) -> bb4;
    }

    bb1: {
        StorageDead(_3);
        FakeRead(ForLet(None), _2);
        AscribeUserType(_2, o, UserTypeProjection { base: UserType(1), projs: [] });
        StorageLive(_4);
        StorageLive(_5);
        _5 = move _2;
        _4 = f(move _5) -> bb4;
    }

    bb2: {
        StorageDead(_5);
        StorageDead(_4);
        StorageDead(_2);
        unreachable;
    }

    bb3: {
        return;
    }

    bb4 (cleanup): {
        resume;
    }
}