Struct SpanChain 

pub struct SpanChain {
    pub spans: Vec<Span>,
}

A chain of spans tracing a token back through macro expansions.

Fields

spans: Vec<Span>

Sequence of spans, outermost (user-written) first.

Implementations

impl SpanChain

pub fn new() -> Self

Create an empty chain.

pub fn push(&mut self, span: Span)

Push a span onto the chain.

pub fn innermost(&self) -> Option<&Span>

Return the deepest (innermost expanded) span, if any.

pub fn outermost(&self) -> Option<&Span>

Return the outermost (user-facing) span, if any.

pub fn depth(&self) -> usize

Returns the number of spans in the chain.

Trait Implementations

impl Clone for SpanChain

fn clone(&self) -> SpanChain

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SpanChain

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

Formats the value using the given formatter.

impl Default for SpanChain

fn default() -> SpanChain

Returns the “default value” for a type.