Enum rustc_ast::ast::Extern

source ·
pub enum Extern {
    None,
    Implicit(Span),
    Explicit(StrLit, Span),
}
Expand description

extern qualifier on a function item or function type.

Variants§

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None

No explicit extern keyword was used

E.g. fn foo() {}

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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)

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Explicit(StrLit, Span)

An explicit extern keyword was used with an explicit ABI

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

Implementations§

Trait Implementations§

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impl Clone for Extern

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fn clone(&self) -> Extern

Returns a copy of the value. Read more
1.0.0 · source§

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

Performs copy-assignment from source. Read more
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impl Debug for Extern

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

Formats the value using the given formatter. Read more
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impl<__D: Decoder> Decodable<__D> for Extern

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

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

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

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impl Copy for Extern

Auto Trait Implementations§

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impl RefUnwindSafe for Extern

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impl !Send for Extern

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impl !Sync for Extern

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impl Unpin for Extern

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impl UnwindSafe for Extern

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

const: unstable · source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

const: unstable · source§

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

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

const: unstable · source§

fn from(t: T) -> T

Returns the argument unchanged.

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

const: unstable · 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.

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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

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

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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

The type returned in the event of a conversion error.
const: unstable · 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: 32 bytes

Size for each variant:

  • None: 0 bytes
  • Implicit: 8 bytes
  • Explicit: 32 bytes