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error[E0080]: evaluation of constant value failed
--> $DIR/missing_span_in_backtrace.rs:16:9
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16 | / ptr::swap_nonoverlapping(
17 | | &mut ptr1 as *mut _ as *mut MaybeUninit<u8>,
18 | | &mut ptr2 as *mut _ as *mut MaybeUninit<u8>,
19 | | mem::size_of::<&i32>(),
20 | | );
| |_________^ unable to copy parts of a pointer from memory at ALLOC0
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note: inside `swap_nonoverlapping::<MaybeUninit<u8>>`
--> $SRC_DIR/core/src/ptr/mod.rs:LL:COL
note: inside `swap_nonoverlapping::compiletime::<MaybeUninit<u8>>`
--> $SRC_DIR/core/src/ptr/mod.rs:LL:COL
note: inside `std::ptr::swap_nonoverlapping_simple_untyped::<MaybeUninit<u8>>`
--> $SRC_DIR/core/src/ptr/mod.rs:LL:COL
note: inside `std::ptr::read::<MaybeUninit<MaybeUninit<u8>>>`
--> $SRC_DIR/core/src/ptr/mod.rs:LL:COL
= help: this code performed an operation that depends on the underlying bytes representing a pointer
= help: the absolute address of a pointer is not known at compile-time, so such operations are not supported
= note: this error originates in the macro `$crate::intrinsics::const_eval_select` which comes from the expansion of the macro `const_eval_select` (in Nightly builds, run with -Z macro-backtrace for more info)
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0080`.
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