Struct syntax::source_map::ExpnInfo

pub struct ExpnInfo {
    pub call_site: Span,
    pub def_site: Option<Span>,
    pub format: ExpnFormat,
    pub allow_internal_unstable: Option<Rc<[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

Fields

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<Rc<[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

fn clone(&self) -> ExpnInfo

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Encodable for ExpnInfo

fn encode<__S>(&self, s: &mut __S) -> Result<(), <__S as Encoder>::Error> where
    __S: Encoder, 

impl Decodable for ExpnInfo

fn decode<__D>(d: &mut __D) -> Result<ExpnInfo, <__D as Decoder>::Error> where
    __D: Decoder, 

impl Hash for ExpnInfo

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

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 Debug for ExpnInfo

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

Formats the value using the given formatter.