Enum rustc_ast::ast::Extern

pub enum Extern {
    None,
    Implicit(Span),
    Explicit(StrLit, Span),
}

extern qualifier on a function item or function type.

Variants

None

No explicit extern keyword was used.

E.g. fn foo() {}.

Implicit(Span)

An explicit extern keyword was used, but with implicit ABI.

E.g. extern fn foo() {}.

This is just extern "C" (see rustc_target::spec::abi::Abi::FALLBACK).

Explicit(StrLit, Span)

An explicit extern keyword was used with an explicit ABI.

E.g. extern "C" fn foo() {}.

Implementations

impl Extern

pub fn from_abi(abi: Option<StrLit>, span: Span) -> Extern

Trait Implementations

impl Clone for Extern

fn clone(&self) -> Extern

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Extern

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

Formats the value using the given formatter.

impl<__D: SpanDecoder> Decodable<__D> for Extern

fn decode(__decoder: &mut __D) -> Self

impl<__E: SpanEncoder> Encodable<__E> for Extern

fn encode(&self, __encoder: &mut __E)

impl Copy for Extern

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: 32 bytes

Size for each variant:

• None: 0 bytes
• Implicit: 12 bytes
• Explicit: 32 bytes