export fn foo() void {
    comptime var a: u8 = 0;
    _ = [0:&a]*u8;
}
export fn bar() void {
    comptime var a: u8 = 0;
    _ = @Type(.{ .array = .{
        .child = *u8,
        .len = 0,
        .sentinel_ptr = @ptrCast(&&a),
    } });
}

export fn baz() void {
    comptime var a: u8 = 0;
    _ = [:&a]*u8;
}
export fn qux() void {
    comptime var a: u8 = 0;
    _ = @Type(.{ .pointer = .{
        .size = .many,
        .is_const = false,
        .is_volatile = false,
        .alignment = @alignOf(u8),
        .address_space = .generic,
        .child = *u8,
        .is_allowzero = false,
        .sentinel_ptr = @ptrCast(&&a),
    } });
}

// error
//
// :3:12: error: sentinel contains reference to comptime var
// :2:14: note: 'sentinel' points to comptime var declared here
// :7:9: error: sentinel contains reference to comptime var
// :6:14: note: 'sentinel_ptr' points to comptime var declared here
// :16:11: error: sentinel contains reference to comptime var
// :15:14: note: 'sentinel' points to comptime var declared here
// :20:9: error: sentinel contains reference to comptime var
// :19:14: note: 'sentinel_ptr' points to comptime var declared here