Struct proc_macro2::Span

pub struct Span { /* fields omitted */ }

A region of source code, along with macro expansion information.

Methods

impl Span

pub fn call_site() -> Span

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 unwrap(self) -> Span

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.

Trait Implementations

impl Clone for Span

fn clone(&self) -> Span

Returns a copy of the value.

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

Performs copy-assignment from source.

impl From<Span> for Span

fn from(proc_span: Span) -> Span

Performs the conversion.

impl Copy for Span

impl Debug for Span

Prints a span in a form convenient for debugging.

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

Formats the value using the given formatter.