Trait std::marker::Copy

#[lang = "copy"]pub trait Copy: Clone { }

Types whose values can be duplicated simply by copying bits.

By default, variable bindings have 'move semantics.' In other words:

#[derive(Debug)]
struct Foo;

let x = Foo;

let y = x;

// `x` has moved into `y`, and so cannot be used

// println!("{:?}", x); // error: use of moved value

However, if a type implements Copy, it instead has 'copy semantics':

// We can derive a `Copy` implementation. `Clone` is also required, as it's
// a supertrait of `Copy`.
#[derive(Debug, Copy, Clone)]
struct Foo;

let x = Foo;

let y = x;

// `y` is a copy of `x`

println!("{:?}", x); // A-OK!

It's important to note that in these two examples, the only difference is whether you are allowed to access x after the assignment. Under the hood, both a copy and a move can result in bits being copied in memory, although this is sometimes optimized away.

How can I implement Copy?

There are two ways to implement Copy on your type. The simplest is to use derive:

#[derive(Copy, Clone)]
struct MyStruct;

You can also implement Copy and Clone manually:

struct MyStruct;

impl Copy for MyStruct { }

impl Clone for MyStruct {
    fn clone(&self) -> MyStruct {
        *self
    }
}

There is a small difference between the two: the derive strategy will also place a Copy bound on type parameters, which isn't always desired.

What's the difference between Copy and Clone?

Copies happen implicitly, for example as part of an assignment y = x. The behavior of Copy is not overloadable; it is always a simple bit-wise copy.

Cloning is an explicit action, x.clone(). The implementation of Clone can provide any type-specific behavior necessary to duplicate values safely. For example, the implementation of Clone for String needs to copy the pointed-to string buffer in the heap. A simple bitwise copy of String values would merely copy the pointer, leading to a double free down the line. For this reason, String is Clone but not Copy.

Clone is a supertrait of Copy, so everything which is Copy must also implement Clone. If a type is Copy then its Clone implementation only needs to return *self (see the example above).

When can my type be Copy?

A type can implement Copy if all of its components implement Copy. For example, this struct can be Copy:

#[derive(Copy, Clone)]
struct Point {
   x: i32,
   y: i32,
}

A struct can be Copy, and i32 is Copy, therefore Point is eligible to be Copy. By contrast, consider

struct PointList {
    points: Vec<Point>,
}

The struct PointList cannot implement Copy, because Vec<T> is not Copy. If we attempt to derive a Copy implementation, we'll get an error:

the trait `Copy` may not be implemented for this type; field `points` does not implement `Copy`

Shared references (&T) are also Copy, so a type can be Copy, even when it holds shared references of types T that are not Copy. Consider the following struct, which can implement Copy, because it only holds a shared reference to our non-Copy type PointList from above:

#[derive(Copy, Clone)]
struct PointListWrapper<'a> {
    point_list_ref: &'a PointList,
}

When can't my type be Copy?

Some types can't be copied safely. For example, copying &mut T would create an aliased mutable reference. Copying String would duplicate responsibility for managing the String's buffer, leading to a double free.

Generalizing the latter case, any type implementing Drop can't be Copy, because it's managing some resource besides its own size_of::<T> bytes.

If you try to implement Copy on a struct or enum containing non-Copy data, you will get the error E0204.

When should my type be Copy?

Generally speaking, if your type can implement Copy, it should. Keep in mind, though, that implementing Copy is part of the public API of your type. If the type might become non-Copy in the future, it could be prudent to omit the Copy implementation now, to avoid a breaking API change.

Additional implementors

In addition to the implementors listed below, the following types also implement Copy:

• Function item types (i.e., the distinct types defined for each function)
• Function pointer types (e.g., fn() -> i32)
• Array types, for all sizes, if the item type also implements Copy (e.g., [i32; 123456])
• Tuple types, if each component also implements Copy (e.g., (), (i32, bool))
• Closure types, if they capture no value from the environment or if all such captured values implement Copy themselves. Note that variables captured by shared reference always implement Copy (even if the referent doesn't), while variables captured by mutable reference never implement Copy.

Implementations on Foreign Types

impl Copy for __m256d

impl Copy for CpuidResult

impl Copy for __m128d

impl Copy for __m128

impl Copy for __m64

impl Copy for __m256i

impl Copy for __m512d

impl Copy for __m512

impl Copy for __m512i

impl Copy for __m256

impl Copy for __m128i

impl<R> Copy for EhFrameHdr<R> where
    R: Reader + Copy, 

impl<R> Copy for DebugLineStr<R> where
    R: Copy, 

impl<R> Copy for Attribute<R> where
    R: Reader + Copy, 

impl Copy for DwEhPe

impl<R, Offset> Copy for Operation<R, Offset> where
    Offset: Copy + ReaderOffset,
    R: Copy + Reader<Offset = Offset>, 

impl Copy for DwCc

impl Copy for X86

impl<T> Copy for DebugStrOffset<T> where
    T: Copy, 

impl Copy for RunTimeEndian

impl<R> Copy for DebugStrOffsets<R> where
    R: Copy, 

impl Copy for DwOp

impl Copy for DwIdx

impl<T> Copy for UnitOffset<T> where
    T: Copy, 

impl Copy for LineRow

impl<'input, Endian> Copy for EndianSlice<'input, Endian> where
    Endian: Copy + Endianity, 

impl<T> Copy for DebugMacroOffset<T> where
    T: Copy, 

impl Copy for DwVirtuality

impl Copy for ColumnType

impl<T> Copy for DebugTypesOffset<T> where
    T: Copy, 

impl Copy for DwAccess

impl Copy for ValueType

impl Copy for AttributeSpecification

impl Copy for Pointer

impl<R> Copy for RangeLists<R> where
    R: Copy, 

impl Copy for DwInl

impl<R> Copy for LocationLists<R> where
    R: Copy, 

impl Copy for BigEndian

impl Copy for LineEncoding

impl<R> Copy for Expression<R> where
    R: Reader + Copy, 

impl<R> Copy for DebugInfo<R> where
    R: Copy, 

impl<R, Offset> Copy for Location<R, Offset> where
    Offset: Copy + ReaderOffset,
    R: Copy + Reader<Offset = Offset>, 

impl<R, Offset> Copy for FileEntry<R, Offset> where
    Offset: Copy + ReaderOffset,
    R: Copy + Reader<Offset = Offset>, 

impl Copy for DwForm

impl<T> Copy for DieReference<T> where
    T: Copy, 

impl<R, Offset> Copy for CompilationUnitHeader<R, Offset> where
    Offset: Copy + ReaderOffset,
    R: Copy + Reader<Offset = Offset>, 

impl<T> Copy for LocationListsOffset<T> where
    T: Copy, 

impl Copy for SectionId

impl Copy for DwId

impl Copy for DwChildren

impl<'abbrev, 'entry, 'unit, R> Copy for AttrsIter<'abbrev, 'entry, 'unit, R> where
    R: Reader + Copy, 

impl<R> Copy for DebugAbbrev<R> where
    R: Copy, 

impl<R> Copy for DebugLine<R> where
    R: Copy, 

impl<T> Copy for DebugInfoOffset<T> where
    T: Copy, 

impl<R, Offset> Copy for AttributeValue<R, Offset> where
    Offset: Copy + ReaderOffset,
    R: Copy + Reader<Offset = Offset>, 

impl<R, Offset> Copy for UnitHeader<R, Offset> where
    Offset: Copy + ReaderOffset,
    R: Copy + Reader<Offset = Offset>, 

impl Copy for DebugTypeSignature

impl<T> Copy for DebugRngListsIndex<T> where
    T: Copy, 

impl<R, Offset> Copy for TypeUnitHeader<R, Offset> where
    Offset: Copy + ReaderOffset,
    R: Copy + Reader<Offset = Offset>, 

impl<R> Copy for DebugLocLists<R> where
    R: Copy, 

impl<T> Copy for DebugLocListsBase<T> where
    T: Copy, 

impl<R, Offset> Copy for Piece<R, Offset> where
    Offset: Copy + ReaderOffset,
    R: Copy + Reader<Offset = Offset>, 

impl Copy for DwAte

impl Copy for DwRle

impl<R> Copy for DebugAddr<R> where
    R: Copy, 

impl<R> Copy for DebugFrame<R> where
    R: Reader + Copy, 

impl<T> Copy for RangeListsOffset<T> where
    T: Copy, 

impl<T> Copy for DebugLineOffset<T> where
    T: Copy, 

impl Copy for Register

impl<T> Copy for DebugLineStrOffset<T> where
    T: Copy, 

impl Copy for DwTag

impl Copy for DwUt

impl Copy for DwDefaulted

impl Copy for Error

impl Copy for DwAddr

impl<T> Copy for DebugAddrBase<T> where
    T: Copy, 

impl Copy for DwMacro

impl<T> Copy for DebugFrameOffset<T> where
    T: Copy, 

impl Copy for Value

impl<T> Copy for DebugAddrIndex<T> where
    T: Copy, 

impl Copy for Range

impl<R, Offset> Copy for LineInstruction<R, Offset> where
    Offset: Copy + ReaderOffset,
    R: Copy + Reader<Offset = Offset>, 

impl Copy for DwLang

impl<R> Copy for LocationListEntry<R> where
    R: Reader + Copy, 

impl<T> Copy for DebugAbbrevOffset<T> where
    T: Copy, 

impl<R> Copy for DebugLoc<R> where
    R: Copy, 

impl Copy for DwLle

impl Copy for Format

impl Copy for Augmentation

impl Copy for Encoding

impl<R> Copy for OperationIter<R> where
    R: Reader + Copy, 

impl Copy for DwAt

impl<T> Copy for DebugStrOffsetsIndex<T> where
    T: Copy, 

impl Copy for DwLnct

impl Copy for DwVis

impl Copy for DwOrd

impl<T> Copy for EhFrameOffset<T> where
    T: Copy, 

impl Copy for DwLns

impl Copy for ReaderOffsetId

impl Copy for DwLne

impl<R> Copy for DebugRngLists<R> where
    R: Copy, 

impl<T> Copy for DebugRngListsBase<T> where
    T: Copy, 

impl<R> Copy for DebugStr<R> where
    R: Copy, 

impl<T> Copy for DebugLocListsIndex<T> where
    T: Copy, 

impl Copy for Arm

impl Copy for FileEntryFormat

impl Copy for DwCfa

impl<R> Copy for EhFrame<R> where
    R: Reader + Copy, 

impl<T> Copy for UnitSectionOffset<T> where
    T: Copy, 

impl Copy for DwEnd

impl Copy for DwDs

impl<R> Copy for DebugTypes<R> where
    R: Copy, 

impl Copy for LittleEndian

impl<R> Copy for DebugRanges<R> where
    R: Copy, 

impl<T> Copy for DebugStrOffsetsBase<T> where
    T: Copy, 

impl Copy for DwDsc

impl<T> Copy for DebugMacinfoOffset<T> where
    T: Copy, 

impl Copy for X86_64

impl Copy for ImageDebugMisc

impl Copy for RelocationEncoding

impl Copy for ImageDynamicRelocationTable

impl Copy for RelocationInfo

impl Copy for NonPagedDebugInfo

impl<E> Copy for SegmentCommand32<E> where
    E: Endian + Copy, 

impl<E> Copy for Rela32<E> where
    E: Endian + Copy, 

impl Copy for AddressSize

impl Copy for ImageResourceDataEntry

impl<E> Copy for U32Bytes<E> where
    E: Endian + Copy, 

impl Copy for ImageRomOptionalHeader

impl Copy for ImageFunctionEntry

impl Copy for ImageTlsDirectory64

impl<E> Copy for DyldInfoCommand<E> where
    E: Endian + Copy, 

impl<E> Copy for I32<E> where
    E: Endian + Copy, 

impl Copy for FatArch32

impl<E> Copy for NoteCommand<E> where
    E: Endian + Copy, 

impl Copy for ImageSectionHeader

impl<'data, Mach> Copy for SymbolTable<'data, Mach> where
    Mach: MachHeader + Copy,
    <Mach as MachHeader>::Nlist: Copy, 

impl<E> Copy for LcStr<E> where
    E: Endian + Copy, 

impl Copy for ImageAlphaRuntimeFunctionEntry

impl Copy for RelocationTarget

impl Copy for ImageFileHeader

impl Copy for ImageLoadConfigDirectory32

impl Copy for ImageDebugDirectory

impl Copy for ImageRuntimeFunctionEntry

impl Copy for Endianness

impl<E> Copy for FvmlibCommand<E> where
    E: Endian + Copy, 

impl<E> Copy for FvmfileCommand<E> where
    E: Endian + Copy, 

impl<'data> Copy for StringTable<'data>

impl Copy for ImageResourceDirectoryEntry

impl Copy for ImageBoundImportDescriptor

impl Copy for ImageCoffSymbolsHeader

impl Copy for ImageResourceDirStringU

impl<E> Copy for Syminfo32<E> where
    E: Endian + Copy, 

impl Copy for ImageCor20Header

impl<'data, Elf> Copy for SectionTable<'data, Elf> where
    Elf: FileHeader + Copy,
    <Elf as FileHeader>::SectionHeader: Copy, 

impl Copy for ImageBaseRelocation

impl Copy for AnonObjectHeaderV2

impl Copy for SectionFlags

impl<E> Copy for ThreadCommand<E> where
    E: Endian + Copy, 

impl<E> Copy for EntryPointCommand<E> where
    E: Endian + Copy, 

impl<E> Copy for FileHeader32<E> where
    E: Endian + Copy, 

impl Copy for ImageSeparateDebugHeader

impl<'data> Copy for SectionTable<'data>

impl Copy for ImageAuxSymbolSection

impl<E> Copy for I64<E> where
    E: Endian + Copy, 

impl Copy for ImageNtHeaders64

impl Copy for ImageSymbolEx

impl Copy for RelocationKind

impl<E> Copy for SymtabCommand<E> where
    E: Endian + Copy, 

impl Copy for ImageEnclaveImport

impl<E> Copy for Syminfo64<E> where
    E: Endian + Copy, 

impl<E> Copy for I16<E> where
    E: Endian + Copy, 

impl<E> Copy for SubClientCommand<E> where
    E: Endian + Copy, 

impl<E> Copy for SymSegCommand<E> where
    E: Endian + Copy, 

impl Copy for ScatteredRelocationInfo

impl<E> Copy for SegmentCommand64<E> where
    E: Endian + Copy, 

impl<E> Copy for NoteHeader64<E> where
    E: Endian + Copy, 

impl<E> Copy for SubFrameworkCommand<E> where
    E: Endian + Copy, 

impl Copy for ImageFunctionEntry64

impl<E> Copy for I32Bytes<E> where
    E: Endian + Copy, 

impl Copy for BinaryFormat

impl<E> Copy for DylibModule64<E> where
    E: Endian + Copy, 

impl Copy for ImageHotPatchInfo

impl<E> Copy for DylinkerCommand<E> where
    E: Endian + Copy, 

impl<E> Copy for Sym32<E> where
    E: Endian + Copy, 

impl<E> Copy for Dylib<E> where
    E: Endian + Copy, 

impl Copy for ImageExportDirectory

impl<E> Copy for Relocation<E> where
    E: Endian + Copy, 

impl<E> Copy for U16<E> where
    E: Endian + Copy, 

impl Copy for FileFlags

impl<E> Copy for SubLibraryCommand<E> where
    E: Endian + Copy, 

impl Copy for ImageDynamicRelocation64

impl<E> Copy for Dyn32<E> where
    E: Endian + Copy, 

impl Copy for ImageArm64RuntimeFunctionEntry

impl Copy for ImageOptionalHeader64

impl Copy for ImageSymbolBytes

impl Copy for ImageDynamicRelocation32

impl<E> Copy for DylibModule32<E> where
    E: Endian + Copy, 

impl Copy for SectionKind

impl Copy for BigEndian

impl Copy for Architecture

impl<E> Copy for Nlist32<E> where
    E: Endian + Copy, 

impl Copy for ImageDosHeader

impl<E> Copy for Nlist64<E> where
    E: Endian + Copy, 

impl Copy for ImageAuxSymbolFunctionBeginEnd

impl<E> Copy for FileHeader64<E> where
    E: Endian + Copy, 

impl Copy for ImageResourceDirectory

impl<E> Copy for UuidCommand<E> where
    E: Endian + Copy, 

impl<E> Copy for Section64<E> where
    E: Endian + Copy, 

impl<E> Copy for CompressionHeader32<E> where
    E: Endian + Copy, 

impl Copy for FatArch64

impl<'data> Copy for Bytes<'data>

impl Copy for ImageEnclaveConfig32

impl Copy for ImageAuxSymbolFunction

impl Copy for ImageOptionalHeader32

impl<Section> Copy for SymbolFlags<Section> where
    Section: Copy, 

impl Copy for Error

impl<E> Copy for ProgramHeader64<E> where
    E: Endian + Copy, 

impl Copy for ImageDelayloadDescriptor

impl Copy for ImageEpilogueDynamicRelocationHeader

impl<E> Copy for LoadCommand<E> where
    E: Endian + Copy, 

impl<E> Copy for SubUmbrellaCommand<E> where
    E: Endian + Copy, 

impl Copy for ImageTlsDirectory32

impl<E> Copy for BuildToolVersion<E> where
    E: Endian + Copy, 

impl<E> Copy for EncryptionInfoCommand64<E> where
    E: Endian + Copy, 

impl<E> Copy for SourceVersionCommand<E> where
    E: Endian + Copy, 

impl Copy for ImageNtHeaders32

impl Copy for CompressionFormat

impl<E> Copy for Rel32<E> where
    E: Endian + Copy, 

impl Copy for ImageBoundForwarderRef

impl<E> Copy for LinkerOptionCommand<E> where
    E: Endian + Copy, 

impl Copy for AnonObjectHeaderBigobj

impl Copy for ImageAlpha64RuntimeFunctionEntry

impl<E> Copy for Sym64<E> where
    E: Endian + Copy, 

impl Copy for ImageArchitectureEntry

impl<E> Copy for DylibReference<E> where
    E: Endian + Copy, 

impl<E> Copy for SectionHeader32<E> where
    E: Endian + Copy, 

impl<E> Copy for ProgramHeader32<E> where
    E: Endian + Copy, 

impl<E> Copy for I64Bytes<E> where
    E: Endian + Copy, 

impl Copy for ImageOs2Header

impl<E> Copy for TwolevelHintsCommand<E> where
    E: Endian + Copy, 

impl Copy for SectionIndex

impl Copy for ImageVxdHeader

impl Copy for SymbolIndex

impl<E> Copy for U64<E> where
    E: Endian + Copy, 

impl<E> Copy for TwolevelHint<E> where
    E: Endian + Copy, 

impl Copy for ImageAuxSymbolTokenDef

impl<E> Copy for RoutinesCommand_64<E> where
    E: Endian + Copy, 

impl Copy for ImageArmRuntimeFunctionEntry

impl<E> Copy for RoutinesCommand<E> where
    E: Endian + Copy, 

impl<'data, Elf> Copy for SymbolTable<'data, Elf> where
    Elf: FileHeader + Copy,
    <Elf as FileHeader>::Sym: Copy, 

impl Copy for ImageDynamicRelocation32V2

impl Copy for ImageLoadConfigDirectory64

impl<E> Copy for NoteHeader32<E> where
    E: Endian + Copy, 

impl Copy for ImageAuxSymbolCrc

impl<E> Copy for RpathCommand<E> where
    E: Endian + Copy, 

impl Copy for ImageHotPatchBase

impl Copy for ImageLoadConfigCodeIntegrity

impl Copy for ImageImportDescriptor

impl<E> Copy for BuildVersionCommand<E> where
    E: Endian + Copy, 

impl<E> Copy for U64Bytes<E> where
    E: Endian + Copy, 

impl Copy for Ident

impl<E> Copy for Rela64<E> where
    E: Endian + Copy, 

impl<E> Copy for VersionMinCommand<E> where
    E: Endian + Copy, 

impl<E> Copy for DataInCodeEntry<E> where
    E: Endian + Copy, 

impl<E> Copy for U32<E> where
    E: Endian + Copy, 

impl Copy for FatHeader

impl Copy for ImageDynamicRelocation64V2

impl<E> Copy for DylibTableOfContents<E> where
    E: Endian + Copy, 

impl Copy for Guid

impl<E> Copy for PreboundDylibCommand<E> where
    E: Endian + Copy, 

impl Copy for ImageResourceDirectoryString

impl<E> Copy for SectionHeader64<E> where
    E: Endian + Copy, 

impl<E> Copy for U16Bytes<E> where
    E: Endian + Copy, 

impl Copy for ImageLinenumber

impl Copy for ImageArchiveMemberHeader

impl<E> Copy for PrebindCksumCommand<E> where
    E: Endian + Copy, 

impl<E> Copy for MachHeader32<E> where
    E: Endian + Copy, 

impl<E> Copy for EncryptionInfoCommand<E> where
    E: Endian + Copy, 

impl Copy for ImageDataDirectory

impl Copy for SymbolKind

impl<E> Copy for DylibCommand<E> where
    E: Endian + Copy, 

impl<E> Copy for CompressionHeader64<E> where
    E: Endian + Copy, 

impl<E> Copy for Rel64<E> where
    E: Endian + Copy, 

impl Copy for ImageRomHeaders

impl<E> Copy for DysymtabCommand<E> where
    E: Endian + Copy, 

impl Copy for LittleEndian

impl<E> Copy for Fvmlib<E> where
    E: Endian + Copy, 

impl<E> Copy for Dyn64<E> where
    E: Endian + Copy, 

impl<E> Copy for IdentCommand<E> where
    E: Endian + Copy, 

impl Copy for ImageEnclaveConfig64

impl<E> Copy for I16Bytes<E> where
    E: Endian + Copy, 

impl Copy for ImageSymbolExBytes

impl Copy for ImageSymbol

impl Copy for ImagePrologueDynamicRelocationHeader

impl Copy for SymbolSection

impl Copy for ImageAuxSymbolWeak

impl Copy for SymbolScope

impl Copy for ImportObjectHeader

impl<E> Copy for LinkeditDataCommand<E> where
    E: Endian + Copy, 

impl Copy for ImageImportByName

impl<'data> Copy for CompressedData<'data>

impl Copy for ImageRelocation

impl<E> Copy for MachHeader64<E> where
    E: Endian + Copy, 

impl Copy for ImageHotPatchHashes

impl Copy for AnonObjectHeader

impl<E> Copy for Section32<E> where
    E: Endian + Copy, 

impl Copy for CompressionStrategy

impl Copy for TDEFLStatus

impl Copy for TINFLStatus

impl Copy for MZFlush

impl Copy for StreamResult

impl Copy for MZError

impl Copy for DataFormat

impl Copy for CompressionLevel

impl Copy for TDEFLFlush

impl Copy for MZStatus

impl Copy for Adler32

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Implementors

impl Copy for std::cmp::Ordering

impl Copy for Infallible

impl Copy for ErrorKind

impl Copy for SeekFrom

impl Copy for IpAddr

impl Copy for Ipv6MulticastScope

impl Copy for Shutdown

impl Copy for SocketAddr

impl Copy for FpCategory

impl Copy for SearchStep

impl Copy for std::sync::atomic::Ordering

impl Copy for RecvTimeoutError

impl Copy for TryRecvError

impl Copy for bool

impl Copy for char

impl Copy for f32

impl Copy for f64

impl Copy for i8

impl Copy for i16

impl Copy for i32

impl Copy for i64

impl Copy for i128

impl Copy for isize

impl Copy for !

impl Copy for u8

impl Copy for u16

impl Copy for u32

impl Copy for u64

impl Copy for u128

impl Copy for usize

impl Copy for AllocErr

impl Copy for Global

impl Copy for Layout

impl Copy for System

impl Copy for TypeId

impl Copy for TryFromSliceError

impl Copy for CharTryFromError

impl Copy for std::fmt::Error

impl Copy for FileType

impl Copy for PhantomPinned

impl Copy for Ipv4Addr

impl Copy for Ipv6Addr

impl Copy for SocketAddrV4

impl Copy for SocketAddrV6

impl Copy for NonZeroI8

impl Copy for NonZeroI16

impl Copy for NonZeroI32

impl Copy for NonZeroI64

impl Copy for NonZeroI128

impl Copy for NonZeroIsize

impl Copy for NonZeroU8

impl Copy for NonZeroU16

impl Copy for NonZeroU32

impl Copy for NonZeroU64

impl Copy for NonZeroU128

impl Copy for NonZeroUsize

impl Copy for TryFromIntError

impl Copy for RangeFull

impl Copy for NoneError

impl Copy for ExitCode

impl Copy for ExitStatus

impl Copy for TraitObject

impl Copy for Utf8Error

impl Copy for RecvError

impl Copy for WaitTimeoutResult

impl Copy for RawWakerVTable

impl Copy for AccessError

impl Copy for ThreadId

impl Copy for Duration

impl Copy for Instant

impl Copy for SystemTime

impl<'_, T> Copy for &'_ T where
    T: ?Sized, 

Shared references can be copied, but mutable references cannot!

impl<'a> Copy for Component<'a>

impl<'a> Copy for Prefix<'a>

impl<'a> Copy for Arguments<'a>

impl<'a> Copy for IoSlice<'a>

impl<'a> Copy for std::panic::Location<'a>

impl<'a> Copy for Ancestors<'a>

impl<'a> Copy for PrefixComponent<'a>

impl<F> Copy for RepeatWith<F> where
    F: Copy, 

impl<Idx> Copy for RangeTo<Idx> where
    Idx: Copy, 

impl<Idx> Copy for RangeToInclusive<Idx> where
    Idx: Copy, 

impl<P> Copy for Pin<P> where
    P: Copy, 

impl<T> Copy for Bound<T> where
    T: Copy, 

impl<T> Copy for Option<T> where
    T: Copy, 

impl<T> Copy for Poll<T> where
    T: Copy, 

impl<T> Copy for *const T where
    T: ?Sized, 

impl<T> Copy for *mut T where
    T: ?Sized, 

impl<T> Copy for Reverse<T> where
    T: Copy, 

impl<T> Copy for PhantomData<T> where
    T: ?Sized, 

impl<T> Copy for Discriminant<T>

impl<T> Copy for ManuallyDrop<T> where
    T: Copy + ?Sized, 

impl<T> Copy for Wrapping<T> where
    T: Copy, 

impl<T> Copy for NonNull<T> where
    T: ?Sized, 

impl<T> Copy for MaybeUninit<T> where
    T: Copy, 

impl<T, E> Copy for Result<T, E> where
    E: Copy,
    T: Copy, 

impl<T: Copy> Copy for TrySendError<T>

impl<T: Copy> Copy for SendError<T>

impl<Y, R> Copy for GeneratorState<Y, R> where
    R: Copy,
    Y: Copy, 

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