83                     return None;  in try_to_nonzero_elem_size()
109         None => const_unreachable!(),
120             None => const_unreachable!(),
133         None => const_unreachable!(),
140         None => const_unreachable!(),
188             None => Self::MIN_ALIGN,  in new_zst()
217                 None => const_unreachable!(),  in for_type()
254                 None => const_unreachable!(),  in for_slice()
348             None => Self::THEORETICAL_MAX_ALIGN,  in extend()
403                     None => const_panic!("Adding padding to `self`'s size overflows `usize`."),  in extend()
423 …     None => const_panic!("`field` cannot be appended without the total size overflowing `usize`"),  in extend()
445 …     None => const_panic!("`field` cannot be appended without the total size overflowing `usize`"),  in extend()
502                     None => const_panic!("Adding padding caused size to overflow `usize`."),  in pad_to_align()
637             None => const_panic!("attempted to cast to slice type with zero-sized element"),  in validate_cast_and_convert_metadata()
698                     None => return Err(MetadataCastError::Size),  in validate_cast_and_convert_metadata()
918                         return None;  in project()
927                                 return None;  in project()
938                                 return None;  in project()
944                                 return None;  in project()
953                                 return None;  in project()
970                                 return None;  in project()
976                                 return None;  in project()
993                                 return None;  in project()
1013                         _ => return None,  in project()
1077                         None => const_panic!(  in project()
1134                     core::iter::once(None).chain((0..29).map(|p| NonZeroUsize::new(2usize.pow(p))));  in test_dst_layout_extend_sized_with_sized()
1193         let packs = core::iter::once(None).chain(aligns.clone().map(Some));  in test_dst_layout_extend_sized_with_dst()
1444 …             (@generate_opt_usize _) => { [None].into_iter().chain((0..8).map(Some).into_iter()) };  in test_validate_cast_and_convert_metadata()
1496         test!(layout((_, [0]), _).validate(_, _, _), Err(Some(msgs::TRAILING) | None),);  in test_validate_cast_and_convert_metadata()
1499         test!(layout(_, _).validate([usize::MAX], (1..100), _), Err(Some(msgs::OVERFLOW) | None));  in test_validate_cast_and_convert_metadata()
1500         test!(layout(_, _).validate((1..100), [usize::MAX], _), Err(Some(msgs::OVERFLOW) | None));  in test_validate_cast_and_convert_metadata()
1507             Err(Some(msgs::OVERFLOW) | None)  in test_validate_cast_and_convert_metadata()
1637                     None => SizeInfo::Sized {  in test_validate_rust_layout()
1757                             let ret = None::<usize>;  in test_validate_rust_layout()
1779                         let f = None::<fn(NonNull<Foo>) -> NonNull<u8>>;  in test_validate_rust_layout()