Struct proc_macro2::Span [−][src]
pub struct Span { /* fields omitted */ }A region of source code, along with macro expansion information.
Implementations
impl Span[src]
impl Span[src]pub fn call_site() -> Span[src]
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[src]
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[src]
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[src]
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[src]
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>[src]
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.