Struct syntax_pos::hygiene::ExpnInfo

pub struct ExpnInfo {
    pub call_site: Span,
    pub def_site: Option<Span>,
    pub format: ExpnFormat,
    pub allow_internal_unstable: bool,
    pub allow_internal_unsafe: 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: bool

Whether the macro is allowed to use #[unstable]/feature-gated features 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)].

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 Hash for ExpnInfo

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

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

Formats the value using the given formatter.

impl Encodable for ExpnInfo

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

impl Decodable for ExpnInfo

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