1 #![feature(const_ptr_offset_from)]
2 #![feature(core_intrinsics)]
4 use std::intrinsics::ptr_offset_from;
12 pub const DIFFERENT_ALLOC: usize = {
13 let uninit = std::mem::MaybeUninit::<Struct>::uninit();
14 let base_ptr: *const Struct = &uninit as *const _ as *const Struct;
15 let uninit2 = std::mem::MaybeUninit::<Struct>::uninit();
16 let field_ptr: *const Struct = &uninit2 as *const _ as *const Struct;
17 let offset = unsafe { ptr_offset_from(field_ptr, base_ptr) }; //~ERROR evaluation of constant value failed
18 //~| cannot compute offset of pointers into different allocations.
22 pub const NOT_PTR: usize = {
23 unsafe { (42 as *const u8).offset_from(&5u8) as usize }
26 pub const NOT_MULTIPLE_OF_SIZE: isize = {
27 let data = [5u8, 6, 7];
28 let base_ptr = data.as_ptr();
29 let field_ptr = &data[1] as *const u8 as *const u16;
30 unsafe { ptr_offset_from(field_ptr, base_ptr as *const u16) } //~ERROR evaluation of constant value failed
31 //~| 1_isize cannot be divided by 2_isize without remainder
34 pub const OFFSET_FROM_NULL: isize = {
35 let ptr = 0 as *const u8;
36 unsafe { ptr_offset_from(ptr, ptr) } //~ERROR evaluation of constant value failed
37 //~| null pointer is not a valid pointer
40 pub const DIFFERENT_INT: isize = { // offset_from with two different integers: like DIFFERENT_ALLOC
41 let ptr1 = 8 as *const u8;
42 let ptr2 = 16 as *const u8;
43 unsafe { ptr_offset_from(ptr2, ptr1) } //~ERROR evaluation of constant value failed
44 //~| 0x10 is not a valid pointer