1 // ignore-x86 FIXME: missing sysroot spans (#53081)
3 #![feature(const_raw_ptr_deref)]
4 #![feature(const_ptr_offset_from)]
5 #![feature(ptr_offset_from)]
13 pub const DIFFERENT_ALLOC: usize = {
15 let uninit = std::mem::MaybeUninit::<Struct>::uninit();
16 let base_ptr: *const Struct = &uninit as *const _ as *const Struct;
17 let uninit2 = std::mem::MaybeUninit::<Struct>::uninit();
18 let field_ptr: *const Struct = &uninit2 as *const _ as *const Struct;
19 let offset = unsafe { field_ptr.offset_from(base_ptr) };
23 pub const NOT_PTR: usize = {
25 unsafe { (42 as *const u8).offset_from(&5u8) as usize }
28 pub const NOT_MULTIPLE_OF_SIZE: isize = {
30 let data = [5u8, 6, 7];
31 let base_ptr = data.as_ptr();
32 let field_ptr = &data[1] as *const u8 as *const u16;
33 unsafe { field_ptr.offset_from(base_ptr as *const u16) }
36 pub const OFFSET_FROM_NULL: isize = {
38 let ptr = 0 as *const u8;
39 unsafe { ptr.offset_from(ptr) }
42 pub const DIFFERENT_INT: isize = { // offset_from with two different integers: like DIFFERENT_ALLOC
44 let ptr1 = 8 as *const u8;
45 let ptr2 = 16 as *const u8;
46 unsafe { ptr2.offset_from(ptr1) }