Enum rustc_hir::def::DefKind

pub enum DefKind {
    Mod,
    Struct,
    Union,
    Enum,
    Variant,
    Trait,
    TyAlias,
    ForeignTy,
    TraitAlias,
    AssocTy,
    TyParam,
    Fn,
    Const,
    ConstParam,
    Static,
    Ctor(CtorOf, CtorKind),
    AssocFn,
    AssocConst,
    Macro(MacroKind),
    ExternCrate,
    Use,
    ForeignMod,
    AnonConst,
    OpaqueTy,
    Field,
    LifetimeParam,
    GlobalAsm,
    Impl,
    Closure,
    Generator,
}

What kind of definition something is; e.g., mod vs struct.

Variants

Mod

Struct

Refers to the struct itself, DefKind::Ctor refers to its constructor if it exists.

Union

Enum

Variant

Refers to the variant itself, DefKind::Ctor refers to its constructor if it exists.

Trait

TyAlias

Type alias: type Foo = Bar;

ForeignTy

Type from an extern block.

TraitAlias

Trait alias: trait IntIterator = Iterator<Item = i32>;

AssocTy

Associated type: trait MyTrait { type Assoc; }

TyParam

Type parameter: the T in struct Vec<T> { ... }

Fn

Const

ConstParam

Constant generic parameter: struct Foo<const N: usize> { ... }

Static

Ctor(CtorOf, CtorKind)

Refers to the struct or enum variant’s constructor.

The reason Ctor exists in addition to DefKind::Struct and DefKind::Variant is because structs and enum variants exist in the type namespace, whereas struct and enum variant constructors exist in the value namespace.

You may wonder why enum variants exist in the type namespace as opposed to the value namespace. Check out RFC 2593 for intuition on why that is.

Tuple Fields of Ctor

0: CtorOf1: CtorKind

AssocFn

Associated function: impl MyStruct { fn associated() {} }

AssocConst

Associated constant: trait MyTrait { const ASSOC: usize; }

Macro(MacroKind)

Tuple Fields of Macro

0: MacroKind

ExternCrate

Use

ForeignMod

An extern block.

AnonConst

Anonymous constant, e.g. the 1 + 2 in [u8; 1 + 2], or const { 1 + 2}

OpaqueTy

Opaque type, aka impl Trait.

Field

LifetimeParam

Lifetime parameter: the 'a in struct Foo<'a> { ... }

GlobalAsm

A use of global_asm!.

Impl

Closure

Generator

Implementations

impl DefKind

pub fn descr(self, def_id: DefId) -> &'static str

pub fn article(&self) -> &'static str

Gets an English article for the definition.

pub fn ns(&self) -> Option<Namespace>

Trait Implementations

impl Clone for DefKind

fn clone(&self) -> DefKind

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for DefKind

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<__D: Decoder> Decodable<__D> for DefKind

fn decode(__decoder: &mut __D) -> Result<Self, <__D as Decoder>::Error>

impl<__E: Encoder> Encodable<__E> for DefKind

fn encode(&self, __encoder: &mut __E) -> Result<(), <__E as Encoder>::Error>

impl Hash for DefKind

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given Hasher.

impl<__CTX> HashStable<__CTX> for DefKind where
    __CTX: HashStableContext, 

fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)

impl PartialEq<DefKind> for DefKind

fn eq(&self, other: &DefKind) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &DefKind) -> bool

This method tests for !=.

impl Copy for DefKind

impl Eq for DefKind

impl StructuralEq for DefKind

impl StructuralPartialEq for DefKind

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: 3 bytes

Size for each variant:

• Mod: 0 bytes
• Struct: 0 bytes
• Union: 0 bytes
• Enum: 0 bytes
• Variant: 0 bytes
• Trait: 0 bytes
• TyAlias: 0 bytes
• ForeignTy: 0 bytes
• TraitAlias: 0 bytes
• AssocTy: 0 bytes
• TyParam: 0 bytes
• Fn: 0 bytes
• Const: 0 bytes
• ConstParam: 0 bytes
• Static: 0 bytes
• Ctor: 2 bytes
• AssocFn: 0 bytes
• AssocConst: 0 bytes
• Macro: 1 byte
• ExternCrate: 0 bytes
• Use: 0 bytes
• ForeignMod: 0 bytes
• AnonConst: 0 bytes
• OpaqueTy: 0 bytes
• Field: 0 bytes
• LifetimeParam: 0 bytes
• GlobalAsm: 0 bytes
• Impl: 0 bytes
• Closure: 0 bytes
• Generator: 0 bytes