error[E0080]: evaluation of constant value failed --> $SRC_DIR/core/src/ptr/mod.rs:LL:COL | = note: unable to copy parts of a pointer from memory at ALLOC0 | note: inside `std::ptr::read::>>` --> $SRC_DIR/core/src/ptr/mod.rs:LL:COL note: inside `mem::swap_simple::>>` --> $SRC_DIR/core/src/mem/mod.rs:LL:COL note: inside `ptr::swap_nonoverlapping_simple_untyped::>` --> $SRC_DIR/core/src/ptr/mod.rs:LL:COL note: inside `swap_nonoverlapping::>` --> $SRC_DIR/core/src/ptr/mod.rs:LL:COL note: inside `X` --> $DIR/missing_span_in_backtrace.rs:17:9 | 17 | / ptr::swap_nonoverlapping( 18 | | &mut ptr1 as *mut _ as *mut MaybeUninit, 19 | | &mut ptr2 as *mut _ as *mut MaybeUninit, 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`.