Struct proc_macro2::Span [−][src]
A region of source code, along with macro expansion information.
Implementations
impl Span
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pub fn call_site() -> Span
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The span of the invocation of the current procedural macro.
Identifiers created with this span will be resolved as if they were written directly at the macro call location (call-site hygiene) and other code at the macro call site will be able to refer to them as well.
pub fn mixed_site() -> Span
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The span located at the invocation of the procedural macro, but with
local variables, labels, and $crate
resolved at the definition site
of the macro. This is the same hygiene behavior as macro_rules
.
This function requires Rust 1.45 or later.
pub fn resolved_at(&self, other: Span) -> Span
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Creates a new span with the same line/column information as self
but
that resolves symbols as though it were at other
.
pub fn located_at(&self, other: Span) -> Span
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Creates a new span with the same name resolution behavior as self
but
with the line/column information of other
.
pub fn unwrap(self) -> Span
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Convert proc_macro2::Span
to proc_macro::Span
.
This method is available when building with a nightly compiler, or when building with rustc 1.29+ without semver exempt features.
Panics
Panics if called from outside of a procedural macro. Unlike
proc_macro2::Span
, the proc_macro::Span
type can only exist within
the context of a procedural macro invocation.
pub fn join(&self, other: Span) -> Option<Span>
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Create a new span encompassing self
and other
.
Returns None
if self
and other
are from different files.
Warning: the underlying proc_macro::Span::join
method is
nightly-only. When called from within a procedural macro not using a
nightly compiler, this method will always return None
.
Trait Implementations
impl Clone for Span
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impl Copy for Span
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impl Debug for Span
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Prints a span in a form convenient for debugging.
impl From<Span> for Span
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Auto Trait Implementations
impl RefUnwindSafe for Span
impl !Send for Span
impl !Sync for Span
impl Unpin for Span
impl UnwindSafe for Span
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
pub fn to_owned(&self) -> T
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pub fn clone_into(&self, target: &mut T)
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,