Struct Spans 

pub struct Spans { /* private fields */ }

The compiler spans one capture issued handles for.

A handle means “the token at this index of the table its producer built”, and this is that table when the producer is a proc macro. It is what lets a refusal land on the offending token rather than on the declaration’s first one, because it is what holds the compiler’s own spans.

Implementations

impl Spans

pub const fn empty() -> Self

A table that has issued nothing.

pub fn at(&self, handle: SpanHandle) -> Span

The compiler span one handle names, or the invocation where this table does not reach it.

One lookup for every road that holds a handle, so a diagnostic the compiler composed and a capture this host refused point at their token the same way. Where the table does not reach, the invocation stands — never the declaration’s first span, which is a real token the observation is not about and would read exactly like an answer.

Trait Implementations

impl Debug for Spans

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

Formats the value using the given formatter.