Trait Span

pub trait Span: ProcMacro<Span = Self> + Copy {
    // Required methods
    fn call_site() -> Self;
    fn mixed_site() -> Self;
    fn resolved_at(&self, other: Self) -> Self;
    fn located_at(&self, other: Self) -> Self;
    fn source_text(&self) -> Option<String>;
}

Span API trait. See proc_macro::Span.

This trait is implemented for Span in proc_macro and proc_macro2 if the corresponding feature is enabled.

See also SpanExt.

Required Methods

fn call_site() -> Self

Create a new Span with call site hygiene.

fn mixed_site() -> Self

Create a new Span with mixed site hygiene.

fn resolved_at(&self, other: Self) -> Self

Create a new Span with the same position as self but that resolves as if it was other.

fn located_at(&self, other: Self) -> Self

Create a new Span that resolves like self but with the position of other.

fn source_text(&self) -> Option<String>

Get the source text of the span, if any. Observable behaviour should not rely on this.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl Span for Span

Available on crate feature proc-macro only.

fn call_site() -> Self

fn mixed_site() -> Self

fn resolved_at(&self, other: Self) -> Self

fn located_at(&self, other: Self) -> Self

fn source_text(&self) -> Option<String>

impl Span for Span

Available on crate feature proc-macro2 only.

fn call_site() -> Self

fn mixed_site() -> Self

fn resolved_at(&self, other: Self) -> Self

fn located_at(&self, other: Self) -> Self

fn source_text(&self) -> Option<String>

Implementors