pub struct Ignored;
Expand description
An efficient way of discarding data from a syntax element.
All syntax elements will be successfully read into
the Ignored
struct, with all properties discarded.
Trait Implementations§
source§impl FromDeriveInput for Ignored
impl FromDeriveInput for Ignored
source§fn from_derive_input(_: &DeriveInput) -> Result<Ignored, Error>
fn from_derive_input(_: &DeriveInput) -> Result<Ignored, Error>
Create an instance from
syn::DeriveInput
, or return an error.source§impl FromGenericParam for Ignored
impl FromGenericParam for Ignored
fn from_generic_param(_: &GenericParam) -> Result<Ignored, Error>
source§impl FromMeta for Ignored
impl FromMeta for Ignored
source§fn from_meta(_: &Meta) -> Result<Ignored, Error>
fn from_meta(_: &Meta) -> Result<Ignored, Error>
Create an instance from a
syn::Meta
by dispatching to the format-appropriate
trait function. This generally should not be overridden by implementers. Read morefn from_nested_meta(item: &NestedMeta) -> Result<Self, Error>
source§fn from_none() -> Option<Self>
fn from_none() -> Option<Self>
When a field is omitted from a parent meta-item,
from_none
is used to attempt
recovery before a missing field error is generated. Read moresource§fn from_word() -> Result<Self, Error>
fn from_word() -> Result<Self, Error>
Create an instance from the presence of the word in the attribute with no
additional options specified.
source§fn from_list(items: &[NestedMeta]) -> Result<Self, Error>
fn from_list(items: &[NestedMeta]) -> Result<Self, Error>
Create an instance from a list of nested meta items.
source§fn from_value(value: &Lit) -> Result<Self, Error>
fn from_value(value: &Lit) -> Result<Self, Error>
Create an instance from a literal value of either
foo = "bar"
or foo("bar")
.
This dispatches to the appropriate method based on the type of literal encountered,
and generally should not be overridden by implementers. Read moresource§fn from_char(value: char) -> Result<Self, Error>
fn from_char(value: char) -> Result<Self, Error>
Create an instance from a char literal in a value position.
source§impl FromTypeParam for Ignored
impl FromTypeParam for Ignored
source§impl FromVariant for Ignored
impl FromVariant for Ignored
source§impl PartialEq<Ignored> for Ignored
impl PartialEq<Ignored> for Ignored
source§impl UsesLifetimes for Ignored
impl UsesLifetimes for Ignored
source§fn uses_lifetimes<'a>(
&self,
_opts: &Options,
_: &'a HashSet<Lifetime, BuildHasherDefault<FnvHasher>>
) -> HashSet<&'a Lifetime, BuildHasherDefault<FnvHasher>>
fn uses_lifetimes<'a>( &self, _opts: &Options, _: &'a HashSet<Lifetime, BuildHasherDefault<FnvHasher>> ) -> HashSet<&'a Lifetime, BuildHasherDefault<FnvHasher>>
Returns the subset of the queried lifetimes that are used by the implementing syntax element. Read more
source§fn uses_lifetimes_cloned(
&self,
options: &Options,
lifetimes: &HashSet<Lifetime, BuildHasherDefault<FnvHasher>>
) -> HashSet<Lifetime, BuildHasherDefault<FnvHasher>>
fn uses_lifetimes_cloned( &self, options: &Options, lifetimes: &HashSet<Lifetime, BuildHasherDefault<FnvHasher>> ) -> HashSet<Lifetime, BuildHasherDefault<FnvHasher>>
Find all used lifetimes, then clone them and return that set.
source§impl UsesTypeParams for Ignored
impl UsesTypeParams for Ignored
source§fn uses_type_params<'a>(
&self,
_opts: &Options,
_: &'a HashSet<Ident, BuildHasherDefault<FnvHasher>>
) -> HashSet<&'a Ident, BuildHasherDefault<FnvHasher>>
fn uses_type_params<'a>( &self, _opts: &Options, _: &'a HashSet<Ident, BuildHasherDefault<FnvHasher>> ) -> HashSet<&'a Ident, BuildHasherDefault<FnvHasher>>
Returns the subset of the queried type parameters that are used by the implementing syntax element. Read more
source§fn uses_type_params_cloned(
&self,
options: &Options,
type_set: &HashSet<Ident, BuildHasherDefault<FnvHasher>>
) -> HashSet<Ident, BuildHasherDefault<FnvHasher>>
fn uses_type_params_cloned( &self, options: &Options, type_set: &HashSet<Ident, BuildHasherDefault<FnvHasher>> ) -> HashSet<Ident, BuildHasherDefault<FnvHasher>>
Find all type params using
uses_type_params
, then clone the found values and return the set.