Struct syntax_pos::hygiene::ExpnInfo [−][src]
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 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: 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)]
.
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
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impl Clone for ExpnInfo
fn clone(&self) -> ExpnInfo
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fn clone(&self) -> ExpnInfo
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
1.0.0[src]
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
impl Hash for ExpnInfo
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impl Hash for ExpnInfo
fn hash<__H: Hasher>(&self, state: &mut __H)
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fn hash<__H: Hasher>(&self, state: &mut __H)
Feeds this value into the given [Hasher
]. Read more
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
1.3.0[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 Debug for ExpnInfo
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impl Debug for ExpnInfo
fn fmt(&self, f: &mut Formatter) -> Result
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fn fmt(&self, f: &mut Formatter) -> Result
Formats the value using the given formatter. Read more
impl Encodable for ExpnInfo
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impl Encodable for ExpnInfo
impl Decodable for ExpnInfo
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impl Decodable for ExpnInfo