Struct rustc_middle::ty::VariantDef[][src]

pub struct VariantDef {
    pub def_id: DefId,
    pub ctor_def_id: Option<DefId>,
    pub ident: Ident,
    pub discr: VariantDiscr,
    pub fields: Vec<FieldDef>,
    pub ctor_kind: CtorKind,
    flags: VariantFlags,
Expand description

Definition of a variant – a struct’s fields or an enum variant.


def_id: DefId

DefId that identifies the variant itself. If this variant belongs to a struct or union, then this is a copy of its DefId.

ctor_def_id: Option<DefId>

DefId that identifies the variant’s constructor. If this variant is a struct variant, then this is None.

ident: Ident

Variant or struct name.

discr: VariantDiscr

Discriminant of this variant.

fields: Vec<FieldDef>

Fields of this variant.

ctor_kind: CtorKind

Type of constructor of variant.

flags: VariantFlags

Flags of the variant (e.g. is field list non-exhaustive)?


Calculates the forest of DefIds from which this variant is visibly uninhabited.

Creates a new VariantDef.

variant_did is the DefId that identifies the enum variant (if this VariantDef represents an enum variant).

ctor_did is the DefId that identifies the constructor of unit or tuple-variants/structs. If this is a struct-variant then this should be None.

parent_did is the DefId of the AdtDef representing the enum or struct that owns this variant. It is used for checking if a struct has #[non_exhaustive] w/out having to go through the redirect of checking the ctor’s attributes - but compiling a small crate requires loading the AdtDefs for all the structs in the universe (e.g., coherence for any built-in trait), and we do not want to load attributes twice.

If someone speeds up attribute loading to not be a performance concern, they can remove this hack and use the constructor DefId everywhere.

Is this field list non-exhaustive?

Was this variant obtained as part of recovering from a syntactic error?

Trait Implementations

Formats the value using the given formatter. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Performs the conversion.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.


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: 72 bytes