[][src]Struct syntax_pos::hygiene::ExpnInfo

pub struct ExpnInfo {
    pub call_site: Span,
    pub def_site: Option<Span>,
    pub format: ExpnFormat,
    pub allow_internal_unstable: Option<Lrc<[Symbol]>>,
    pub allow_internal_unsafe: bool,
    pub local_inner_macros: bool,
    pub edition: Edition,

Extra information for tracking spans of macro and syntax sugar expansion


call_site: Span

The location of the actual macro invocation or syntax sugar , e.g. let x = foo!(); or if let Some(y) = x {}

This may recursively refer to other macro invocations, e.g., if foo!() invoked bar!() internally, and there was an expression inside bar!; the call_site of the expression in the expansion would point to the bar! invocation; that call_site span would have its own ExpnInfo, with the call_site pointing to the foo! invocation.

def_site: Option<Span>

The span of the macro definition itself. The macro may not have a sensible definition span (e.g., something defined completely inside libsyntax) in which case this is None. This span serves only informational purpose and is not used for resolution.

format: ExpnFormat

The format with which the macro was invoked.

allow_internal_unstable: Option<Lrc<[Symbol]>>

List of #[unstable]/feature-gated features that the macro is allowed to use internally without forcing the whole crate to opt-in to them.

allow_internal_unsafe: bool

Whether the macro is allowed to use unsafe internally even if the user crate has #![forbid(unsafe_code)].

local_inner_macros: bool

Enables the macro helper hack (ident!(...) -> $crate::ident!(...)) for a given macro.

edition: Edition

Edition of the crate in which the macro is defined.

Trait Implementations

impl Clone for ExpnInfo[src]

fn clone_from(&mut self, source: &Self)1.0.0[src]

Performs copy-assignment from source. Read more

impl Debug for ExpnInfo[src]

impl Hash for ExpnInfo[src]

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

Feeds a slice of this type into the given [Hasher]. Read more

impl Encodable for ExpnInfo[src]

impl Decodable for ExpnInfo[src]

Auto Trait Implementations

impl !Send for ExpnInfo

impl !Sync for ExpnInfo

Blanket Implementations

impl<T> ToOwned for T where
    T: Clone

type Owned = T

The resulting type after obtaining ownership.

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

impl<T> From<T> for T[src]

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 

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

The type returned in the event of a conversion error.

impl<T> BorrowMut<T> for T where
    T: ?Sized

impl<T> Borrow<T> for T where
    T: ?Sized

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

impl<T> Encodable for T where
    T: UseSpecializedEncodable + ?Sized

impl<T> Decodable for T where
    T: UseSpecializedDecodable

impl<E> SpecializationError for E[src]

impl<T> Erased for T[src]

impl<T> Send for T where
    T: ?Sized

impl<T> Sync for T where
    T: ?Sized