Struct polkadot_service::runtime_traits::PhantomData
1.0.0 · source · pub struct PhantomData<T>
where
T: ?Sized;
Expand description
Zero-sized type used to mark things that “act like” they own a T
.
Adding a PhantomData<T>
field to your type tells the compiler that your
type acts as though it stores a value of type T
, even though it doesn’t
really. This information is used when computing certain safety properties.
For a more in-depth explanation of how to use PhantomData<T>
, please see
the Nomicon.
§A ghastly note 👻👻👻
Though they both have scary names, PhantomData
and ‘phantom types’ are
related, but not identical. A phantom type parameter is simply a type
parameter which is never used. In Rust, this often causes the compiler to
complain, and the solution is to add a “dummy” use by way of PhantomData
.
§Examples
§Unused lifetime parameters
Perhaps the most common use case for PhantomData
is a struct that has an
unused lifetime parameter, typically as part of some unsafe code. For
example, here is a struct Slice
that has two pointers of type *const T
,
presumably pointing into an array somewhere:
struct Slice<'a, T> {
start: *const T,
end: *const T,
}
The intention is that the underlying data is only valid for the
lifetime 'a
, so Slice
should not outlive 'a
. However, this
intent is not expressed in the code, since there are no uses of
the lifetime 'a
and hence it is not clear what data it applies
to. We can correct this by telling the compiler to act as if the
Slice
struct contained a reference &'a T
:
use std::marker::PhantomData;
struct Slice<'a, T> {
start: *const T,
end: *const T,
phantom: PhantomData<&'a T>,
}
This also in turn infers the lifetime bound T: 'a
, indicating
that any references in T
are valid over the lifetime 'a
.
When initializing a Slice
you simply provide the value
PhantomData
for the field phantom
:
fn borrow_vec<T>(vec: &Vec<T>) -> Slice<'_, T> {
let ptr = vec.as_ptr();
Slice {
start: ptr,
end: unsafe { ptr.add(vec.len()) },
phantom: PhantomData,
}
}
§Unused type parameters
It sometimes happens that you have unused type parameters which
indicate what type of data a struct is “tied” to, even though that
data is not actually found in the struct itself. Here is an
example where this arises with FFI. The foreign interface uses
handles of type *mut ()
to refer to Rust values of different
types. We track the Rust type using a phantom type parameter on
the struct ExternalResource
which wraps a handle.
use std::marker::PhantomData;
use std::mem;
struct ExternalResource<R> {
resource_handle: *mut (),
resource_type: PhantomData<R>,
}
impl<R: ResType> ExternalResource<R> {
fn new() -> Self {
let size_of_res = mem::size_of::<R>();
Self {
resource_handle: foreign_lib::new(size_of_res),
resource_type: PhantomData,
}
}
fn do_stuff(&self, param: ParamType) {
let foreign_params = convert_params(param);
foreign_lib::do_stuff(self.resource_handle, foreign_params);
}
}
§Ownership and the drop check
The exact interaction of PhantomData
with drop check may change in the future.
Currently, adding a field of type PhantomData<T>
indicates that your type owns data of type
T
in very rare circumstances. This in turn has effects on the Rust compiler’s drop check
analysis. For the exact rules, see the drop check documentation.
§Layout
For all T
, the following are guaranteed:
size_of::<PhantomData<T>>() == 0
align_of::<PhantomData<T>>() == 1
Trait Implementations§
§impl<'a, A> Arbitrary<'a> for PhantomData<A>where
A: Arbitrary<'a>,
impl<'a, A> Arbitrary<'a> for PhantomData<A>where
A: Arbitrary<'a>,
§fn arbitrary(_: &mut Unstructured<'a>) -> Result<PhantomData<A>, Error>
fn arbitrary(_: &mut Unstructured<'a>) -> Result<PhantomData<A>, Error>
Self
from the given unstructured data. Read more§fn size_hint(_depth: usize) -> (usize, Option<usize>)
fn size_hint(_depth: usize) -> (usize, Option<usize>)
Unstructured
this type
needs to construct itself. Read more§fn arbitrary_take_rest(u: Unstructured<'a>) -> Result<Self, Error>
fn arbitrary_take_rest(u: Unstructured<'a>) -> Result<Self, Error>
Self
from the entirety of the given
unstructured data. Read more§impl<T> AsBytes for PhantomData<T>where
T: ?Sized,
impl<T> AsBytes for PhantomData<T>where
T: ?Sized,
§fn as_bytes_mut(&mut self) -> &mut [u8] ⓘwhere
Self: FromBytes,
fn as_bytes_mut(&mut self) -> &mut [u8] ⓘwhere
Self: FromBytes,
§fn write_to_prefix(&self, bytes: &mut [u8]) -> Option<()>
fn write_to_prefix(&self, bytes: &mut [u8]) -> Option<()>
§impl<T> CanonicalDeserialize for PhantomData<T>
impl<T> CanonicalDeserialize for PhantomData<T>
§fn deserialize_with_mode<R>(
_reader: R,
_compress: Compress,
_validate: Validate,
) -> Result<PhantomData<T>, SerializationError>where
R: Read,
fn deserialize_with_mode<R>(
_reader: R,
_compress: Compress,
_validate: Validate,
) -> Result<PhantomData<T>, SerializationError>where
R: Read,
fn deserialize_compressed<R>(reader: R) -> Result<Self, SerializationError>where
R: Read,
fn deserialize_compressed_unchecked<R>(
reader: R,
) -> Result<Self, SerializationError>where
R: Read,
fn deserialize_uncompressed<R>(reader: R) -> Result<Self, SerializationError>where
R: Read,
fn deserialize_uncompressed_unchecked<R>(
reader: R,
) -> Result<Self, SerializationError>where
R: Read,
§impl<T> CanonicalSerialize for PhantomData<T>
impl<T> CanonicalSerialize for PhantomData<T>
§fn serialize_with_mode<W>(
&self,
_writer: W,
_compress: Compress,
) -> Result<(), SerializationError>where
W: Write,
fn serialize_with_mode<W>(
&self,
_writer: W,
_compress: Compress,
) -> Result<(), SerializationError>where
W: Write,
fn serialized_size(&self, _compress: Compress) -> usize
fn serialize_compressed<W>(&self, writer: W) -> Result<(), SerializationError>where
W: Write,
fn compressed_size(&self) -> usize
fn serialize_uncompressed<W>(&self, writer: W) -> Result<(), SerializationError>where
W: Write,
fn uncompressed_size(&self) -> usize
1.0.0 · source§impl<T> Clone for PhantomData<T>where
T: ?Sized,
impl<T> Clone for PhantomData<T>where
T: ?Sized,
source§fn clone(&self) -> PhantomData<T>
fn clone(&self) -> PhantomData<T>
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read more1.0.0 · source§impl<T> Debug for PhantomData<T>where
T: ?Sized,
impl<T> Debug for PhantomData<T>where
T: ?Sized,
§impl<'a, T> Decode<'a> for PhantomData<T>where
T: ?Sized,
impl<'a, T> Decode<'a> for PhantomData<T>where
T: ?Sized,
Dummy implementation for PhantomData
which allows deriving
implementations on structs with phantom fields.
§impl<T> Decode for PhantomData<T>
impl<T> Decode for PhantomData<T>
§fn decode<I>(_input: &mut I) -> Result<PhantomData<T>, Error>where
I: Input,
fn decode<I>(_input: &mut I) -> Result<PhantomData<T>, Error>where
I: Input,
§fn decode_into<I>(
input: &mut I,
dst: &mut MaybeUninit<Self>,
) -> Result<DecodeFinished, Error>where
I: Input,
fn decode_into<I>(
input: &mut I,
dst: &mut MaybeUninit<Self>,
) -> Result<DecodeFinished, Error>where
I: Input,
§fn skip<I>(input: &mut I) -> Result<(), Error>where
I: Input,
fn skip<I>(input: &mut I) -> Result<(), Error>where
I: Input,
§fn encoded_fixed_size() -> Option<usize>
fn encoded_fixed_size() -> Option<usize>
1.0.0 · source§impl<T> Default for PhantomData<T>where
T: ?Sized,
impl<T> Default for PhantomData<T>where
T: ?Sized,
source§fn default() -> PhantomData<T>
fn default() -> PhantomData<T>
§impl<T> DerOrd for PhantomData<T>
impl<T> DerOrd for PhantomData<T>
Provide a no-op implementation for PhantomData
source§impl<'de, T> Deserialize<'de> for PhantomData<T>where
T: ?Sized,
impl<'de, T> Deserialize<'de> for PhantomData<T>where
T: ?Sized,
source§fn deserialize<D>(
deserializer: D,
) -> Result<PhantomData<T>, <D as Deserializer<'de>>::Error>where
D: Deserializer<'de>,
fn deserialize<D>(
deserializer: D,
) -> Result<PhantomData<T>, <D as Deserializer<'de>>::Error>where
D: Deserializer<'de>,
source§impl<'de, T> DeserializeSeed<'de> for PhantomData<T>where
T: Deserialize<'de>,
impl<'de, T> DeserializeSeed<'de> for PhantomData<T>where
T: Deserialize<'de>,
source§fn deserialize<D>(
self,
deserializer: D,
) -> Result<T, <D as Deserializer<'de>>::Error>where
D: Deserializer<'de>,
fn deserialize<D>(
self,
deserializer: D,
) -> Result<T, <D as Deserializer<'de>>::Error>where
D: Deserializer<'de>,
Deserialize::deserialize
method, except
with some initial piece of data (the seed) passed in.§impl<T> Encode for PhantomData<T>
impl<T> Encode for PhantomData<T>
§fn encode_to<W>(&self, _dest: &mut W)where
W: Output + ?Sized,
fn encode_to<W>(&self, _dest: &mut W)where
W: Output + ?Sized,
§fn using_encoded<R, F>(&self, f: F) -> R
fn using_encoded<R, F>(&self, f: F) -> R
§fn encoded_size(&self) -> usize
fn encoded_size(&self) -> usize
§impl<T> Encode for PhantomData<T>where
T: ?Sized,
impl<T> Encode for PhantomData<T>where
T: ?Sized,
Dummy implementation for PhantomData
which allows deriving
implementations on structs with phantom fields.
§fn encoded_len(&self) -> Result<Length, Error>
fn encoded_len(&self) -> Result<Length, Error>
§fn encode(&self, _writer: &mut impl Writer) -> Result<(), Error>
fn encode(&self, _writer: &mut impl Writer) -> Result<(), Error>
Writer
].§fn encode_to_slice<'a>(&self, buf: &'a mut [u8]) -> Result<&'a [u8], Error>
fn encode_to_slice<'a>(&self, buf: &'a mut [u8]) -> Result<&'a [u8], Error>
§fn encode_to_vec(&self, buf: &mut Vec<u8>) -> Result<Length, Error>
fn encode_to_vec(&self, buf: &mut Vec<u8>) -> Result<Length, Error>
§impl<T> EncodeAsType for PhantomData<T>
impl<T> EncodeAsType for PhantomData<T>
§fn encode_as_type_to<R>(
&self,
type_id: <R as TypeResolver>::TypeId,
types: &R,
out: &mut Vec<u8>,
) -> Result<(), Error>where
R: TypeResolver,
fn encode_as_type_to<R>(
&self,
type_id: <R as TypeResolver>::TypeId,
types: &R,
out: &mut Vec<u8>,
) -> Result<(), Error>where
R: TypeResolver,
type_id
, types
, a context
and some output target for the SCALE encoded bytes,
attempt to SCALE encode the current value into the type given by type_id
.§impl<T> FromBytes for PhantomData<T>where
T: ?Sized,
impl<T> FromBytes for PhantomData<T>where
T: ?Sized,
§fn slice_from_prefix(bytes: &[u8], count: usize) -> Option<(&[Self], &[u8])>where
Self: Sized,
fn slice_from_prefix(bytes: &[u8], count: usize) -> Option<(&[Self], &[u8])>where
Self: Sized,
bytes
as a &[Self]
with length
equal to count
without copying. Read more§fn slice_from_suffix(bytes: &[u8], count: usize) -> Option<(&[u8], &[Self])>where
Self: Sized,
fn slice_from_suffix(bytes: &[u8], count: usize) -> Option<(&[u8], &[Self])>where
Self: Sized,
bytes
as a &[Self]
with length
equal to count
without copying. Read more§fn mut_slice_from_prefix(
bytes: &mut [u8],
count: usize,
) -> Option<(&mut [Self], &mut [u8])>where
Self: Sized + AsBytes,
fn mut_slice_from_prefix(
bytes: &mut [u8],
count: usize,
) -> Option<(&mut [Self], &mut [u8])>where
Self: Sized + AsBytes,
bytes
as a &mut [Self]
with length
equal to count
without copying. Read more§fn mut_slice_from_suffix(
bytes: &mut [u8],
count: usize,
) -> Option<(&mut [u8], &mut [Self])>where
Self: Sized + AsBytes,
fn mut_slice_from_suffix(
bytes: &mut [u8],
count: usize,
) -> Option<(&mut [u8], &mut [Self])>where
Self: Sized + AsBytes,
bytes
as a &mut [Self]
with length
equal to count
without copying. Read more§fn read_from_prefix(bytes: &[u8]) -> Option<Self>where
Self: Sized,
fn read_from_prefix(bytes: &[u8]) -> Option<Self>where
Self: Sized,
§impl<T> FromZeroes for PhantomData<T>where
T: ?Sized,
impl<T> FromZeroes for PhantomData<T>where
T: ?Sized,
1.0.0 · source§impl<T> Hash for PhantomData<T>where
T: ?Sized,
impl<T> Hash for PhantomData<T>where
T: ?Sized,
§impl<T> IntoVisitor for PhantomData<T>
impl<T> IntoVisitor for PhantomData<T>
§type AnyVisitor<R: TypeResolver> = BasicVisitor<PhantomData<T>, R>
type AnyVisitor<R: TypeResolver> = BasicVisitor<PhantomData<T>, R>
Self
.§fn into_visitor<R>() -> <PhantomData<T> as IntoVisitor>::AnyVisitor<R>where
R: TypeResolver,
fn into_visitor<R>() -> <PhantomData<T> as IntoVisitor>::AnyVisitor<R>where
R: TypeResolver,
§impl<T> JsonSchema for PhantomData<T>where
T: ?Sized,
impl<T> JsonSchema for PhantomData<T>where
T: ?Sized,
§fn is_referenceable() -> bool
fn is_referenceable() -> bool
$ref
keyword. Read more§fn schema_name() -> String
fn schema_name() -> String
§fn json_schema(gen: &mut SchemaGenerator) -> Schema
fn json_schema(gen: &mut SchemaGenerator) -> Schema
§impl<T> MaxEncodedLen for PhantomData<T>
impl<T> MaxEncodedLen for PhantomData<T>
§fn max_encoded_len() -> usize
fn max_encoded_len() -> usize
1.0.0 · source§impl<T> Ord for PhantomData<T>where
T: ?Sized,
impl<T> Ord for PhantomData<T>where
T: ?Sized,
source§fn cmp(&self, _other: &PhantomData<T>) -> Ordering
fn cmp(&self, _other: &PhantomData<T>) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl<T> PalletError for PhantomData<T>
impl<T> PalletError for PhantomData<T>
source§const MAX_ENCODED_SIZE: usize = 0usize
const MAX_ENCODED_SIZE: usize = 0usize
1.0.0 · source§impl<T> PartialEq for PhantomData<T>where
T: ?Sized,
impl<T> PartialEq for PhantomData<T>where
T: ?Sized,
source§fn eq(&self, _other: &PhantomData<T>) -> bool
fn eq(&self, _other: &PhantomData<T>) -> bool
self
and other
values to be equal, and is used
by ==
.1.0.0 · source§impl<T> PartialOrd for PhantomData<T>where
T: ?Sized,
impl<T> PartialOrd for PhantomData<T>where
T: ?Sized,
source§fn partial_cmp(&self, _other: &PhantomData<T>) -> Option<Ordering>
fn partial_cmp(&self, _other: &PhantomData<T>) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moresource§impl<T> Serialize for PhantomData<T>where
T: ?Sized,
impl<T> Serialize for PhantomData<T>where
T: ?Sized,
source§fn serialize<S>(
&self,
serializer: S,
) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>where
S: Serializer,
fn serialize<S>(
&self,
serializer: S,
) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>where
S: Serializer,
§impl<T> TypeInfo for PhantomData<T>
impl<T> TypeInfo for PhantomData<T>
§impl<T> Valid for PhantomData<T>where
T: Sync,
impl<T> Valid for PhantomData<T>where
T: Sync,
§impl<T> ValueOrd for PhantomData<T>
impl<T> ValueOrd for PhantomData<T>
Provide a no-op implementation for PhantomData
§impl<Z> Zeroize for PhantomData<Z>
impl<Z> Zeroize for PhantomData<Z>
PhantomData
is always zero sized so provide a [Zeroize
] implementation.
impl<T> ConstEncodedLen for PhantomData<T>where
T: ConstEncodedLen,
impl<T> Copy for PhantomData<T>where
T: ?Sized,
impl<T> EncodeLike for PhantomData<T>
impl<T> Eq for PhantomData<T>where
T: ?Sized,
impl<T> Freeze for PhantomData<T>where
T: ?Sized,
impl<T> Pod for PhantomData<T>where
T: Pod,
impl<T> StructuralPartialEq for PhantomData<T>where
T: ?Sized,
impl<T> Unaligned for PhantomData<T>where
T: ?Sized,
impl<Z> ZeroizeOnDrop for PhantomData<Z>
[PhantomData
is always zero sized so provide a ZeroizeOnDrop implementation.
Auto Trait Implementations§
impl<T> RefUnwindSafe for PhantomData<T>where
T: RefUnwindSafe + ?Sized,
impl<T> Send for PhantomData<T>
impl<T> Sync for PhantomData<T>
impl<T> Unpin for PhantomData<T>
impl<T> UnwindSafe for PhantomData<T>where
T: UnwindSafe + ?Sized,
Blanket Implementations§
§impl<T> AnySync for T
impl<T> AnySync for T
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
§impl<T> CallHasher for T
impl<T> CallHasher for T
§impl<T> CanonicalSerializeHashExt for Twhere
T: CanonicalSerialize,
impl<T> CanonicalSerializeHashExt for Twhere
T: CanonicalSerialize,
§impl<T> CheckedBitPattern for Twhere
T: AnyBitPattern,
impl<T> CheckedBitPattern for Twhere
T: AnyBitPattern,
§type Bits = T
type Bits = T
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must have the same layout as the specified Bits
except for
the possible invalid bit patterns being checked during
is_valid_bit_pattern
.§fn is_valid_bit_pattern(_bits: &T) -> bool
fn is_valid_bit_pattern(_bits: &T) -> bool
bits
as &Self
.source§impl<T> CheckedConversion for T
impl<T> CheckedConversion for T
source§impl<T> CheckedConversion for T
impl<T> CheckedConversion for T
source§impl<T> CloneToUninit for Twhere
T: Copy,
impl<T> CloneToUninit for Twhere
T: Copy,
source§unsafe fn clone_to_uninit(&self, dst: *mut T)
unsafe fn clone_to_uninit(&self, dst: *mut T)
clone_to_uninit
)source§impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
source§default unsafe fn clone_to_uninit(&self, dst: *mut T)
default unsafe fn clone_to_uninit(&self, dst: *mut T)
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§impl<T> Conv for T
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§impl<T> DecodeAll for Twhere
T: Decode,
impl<T> DecodeAll for Twhere
T: Decode,
§fn decode_all(input: &mut &[u8]) -> Result<T, Error>
fn decode_all(input: &mut &[u8]) -> Result<T, Error>
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and consume all of the given input data. Read more§impl<T> DecodeAsType for Twhere
T: IntoVisitor,
impl<T> DecodeAsType for Twhere
T: IntoVisitor,
fn decode_as_type_maybe_compact<R>(
input: &mut &[u8],
type_id: <R as TypeResolver>::TypeId,
types: &R,
is_compact: bool,
) -> Result<T, Error>where
R: TypeResolver,
§fn decode_as_type<R>(
input: &mut &[u8],
type_id: <R as TypeResolver>::TypeId,
types: &R,
) -> Result<Self, Error>where
R: TypeResolver,
fn decode_as_type<R>(
input: &mut &[u8],
type_id: <R as TypeResolver>::TypeId,
types: &R,
) -> Result<Self, Error>where
R: TypeResolver,
type_id
, and type registry, attempt to decode said bytes into
Self
. Implementations should modify the &mut
reference to the bytes such that any bytes
not used in the course of decoding are still pointed to after decoding is complete.§impl<T> DecodeLimit for Twhere
T: Decode,
impl<T> DecodeLimit for Twhere
T: Decode,
§impl<T> DecodeWithMetadata for Twhere
T: DecodeAsType,
impl<T> DecodeWithMetadata for Twhere
T: DecodeAsType,
§fn decode_with_metadata(
bytes: &mut &[u8],
type_id: u32,
metadata: &Metadata,
) -> Result<T, Error>
fn decode_with_metadata( bytes: &mut &[u8], type_id: u32, metadata: &Metadata, ) -> Result<T, Error>
Self
.source§impl<T> DefensiveMax<T> for Twhere
T: PartialOrd,
impl<T> DefensiveMax<T> for Twhere
T: PartialOrd,
source§fn defensive_max(self, other: T) -> T
fn defensive_max(self, other: T) -> T
source§fn defensive_strict_max(self, other: T) -> T
fn defensive_strict_max(self, other: T) -> T
source§impl<T> DefensiveMin<T> for Twhere
T: PartialOrd,
impl<T> DefensiveMin<T> for Twhere
T: PartialOrd,
source§fn defensive_min(self, other: T) -> T
fn defensive_min(self, other: T) -> T
source§fn defensive_strict_min(self, other: T) -> T
fn defensive_strict_min(self, other: T) -> T
source§impl<T> EncodeInto for Twhere
T: Encode,
impl<T> EncodeInto for Twhere
T: Encode,
§impl<T> EncodeWithMetadata for Twhere
T: EncodeAsType,
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T: EncodeAsType,
source§impl<Q, K> Equivalent<K> for Q
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source§fn equivalent(&self, key: &K) -> bool
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and return true
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§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
§impl<Q, K> Equivalent<K> for Q
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§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
§impl<Q, K> Equivalent<K> for Q
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§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
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and return true
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§fn fmt_binary(self) -> FmtBinary<Self>where
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-formatted.§fn fmt_lower_hex(self) -> FmtLowerHex<Self>where
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