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error[E0080]: evaluation of constant value failed
--> $SRC_DIR/core/src/ptr/mod.rs:LL:COL
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= note: unable to copy parts of a pointer from memory at ALLOC_ID
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note: inside `std::ptr::read::<MaybeUninit<MaybeUninit<u8>>>`
--> $SRC_DIR/core/src/ptr/mod.rs:LL:COL
note: inside `mem::swap_simple::<MaybeUninit<MaybeUninit<u8>>>`
--> $SRC_DIR/core/src/mem/mod.rs:LL:COL
note: inside `ptr::swap_nonoverlapping_simple_untyped::<MaybeUninit<u8>>`
--> $SRC_DIR/core/src/ptr/mod.rs:LL:COL
note: inside `swap_nonoverlapping::<MaybeUninit<u8>>`
--> $SRC_DIR/core/src/ptr/mod.rs:LL:COL
note: inside `X`
--> $DIR/missing_span_in_backtrace.rs:17:9
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17 | / ptr::swap_nonoverlapping(
18 | | &mut ptr1 as *mut _ as *mut MaybeUninit<u8>,
19 | | &mut ptr2 as *mut _ as *mut MaybeUninit<u8>,
20 | | mem::size_of::<&i32>(),
21 | | );
| |_________^
= help: this code performed an operation that depends on the underlying bytes representing a pointer
= help: the absolute address of a pointer is not known at compile-time, so such operations are not supported
error: aborting due to previous error
For more information about this error, try `rustc --explain E0080`.
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