Extern in rustc_ast::ast - Rust (original) (raw)

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

Expand description

extern qualifier on a function item or function type.

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No explicit extern keyword was used.

E.g. fn foo() {}.

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

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

This is just extern "C" (see rustc_abi::ExternAbi::FALLBACK).

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An explicit extern keyword was used with an explicit ABI.

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

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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: