pub enum SubstructureFields<'a> {
    Struct(&'a VariantData, Vec<FieldInfo>),
    AllFieldlessEnum(&'a EnumDef),
    EnumMatching(usize, usize, &'a Variant, Vec<FieldInfo>),
    EnumTag(FieldInfo, Option<P<Expr>>),
    StaticStruct(&'a VariantData, StaticFields),
    StaticEnum(&'a EnumDef, Vec<(Ident, Span, StaticFields)>),
}
Expand description

A summary of the possible sets of fields.

Variants§

§

Struct(&'a VariantData, Vec<FieldInfo>)

A non-static method where Self is a struct.

§

AllFieldlessEnum(&'a EnumDef)

A non-static method handling the entire enum at once (after it has been determined that none of the enum variants has any fields).

§

EnumMatching(usize, usize, &'a Variant, Vec<FieldInfo>)

Matching variants of the enum: variant index, variant count, ast::Variant, fields: the field name is only non-None in the case of a struct variant.

§

EnumTag(FieldInfo, Option<P<Expr>>)

The tag of an enum. The first field is a FieldInfo for the tags, as if they were fields. The second field is the expression to combine the tag expression with; it will be None if no match is necessary.

§

StaticStruct(&'a VariantData, StaticFields)

A static method where Self is a struct.

§

StaticEnum(&'a EnumDef, Vec<(Ident, Span, StaticFields)>)

A static method where Self is an enum.

Auto Trait Implementations§

§

impl<'a> !RefUnwindSafe for SubstructureFields<'a>

§

impl<'a> !Send for SubstructureFields<'a>

§

impl<'a> !Sync for SubstructureFields<'a>

§

impl<'a> Unpin for SubstructureFields<'a>

§

impl<'a> !UnwindSafe for SubstructureFields<'a>

Blanket Implementations§

source§

impl<T> Any for Twhere T: 'static + ?Sized,

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for Twhere T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for Twhere T: ?Sized,

source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T, U> Into<U> for Twhere U: From<T>,

source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

source§

impl<T, U> TryFrom<U> for Twhere U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 64 bytes

Size for each variant:

  • Struct: 32 bytes
  • AllFieldlessEnum: 8 bytes
  • EnumMatching: 48 bytes
  • EnumTag: 64 bytes
  • StaticStruct: 40 bytes
  • StaticEnum: 32 bytes