1const Foo = struct {
 2    a: i32,
 3    b: i32,
 4};
 5const foo = Foo{
 6    .a = 1,
 7    .b = 2,
 8};
 9
10comptime {
11    const another_foo_ptr: *const Foo = @fieldParentPtr("b", &foo.a);
12    _ = another_foo_ptr;
13}
14
15// error
16//
17// :11:41: error: field 'b' has index '1' but pointer value is index '0' of struct 'tmp.Foo'
18// :1:13: note: struct declared here