Struct Span 

pub struct Span {
    pub start: usize,
    pub end: usize,
}

Byte-offset span in the source expression used exclusively for error tracking and diagnostics.

Span carries source positions so that errors can point back at the offending token, and offers richer error reporting.

Note

Offsets are in bytes (not char indices), compatible with Rust’s native &str slicing, and safe across Unicode content because the tokenizer only records positions at char boundaries.

Fields

start: usize

Inclusive start byte offset.

end: usize

Exclusive end byte offset.

Implementations

impl Span

pub const fn new(start: usize, end: usize) -> Self

Construct a span covering [start, end) in byte offsets.

pub const fn point(at: usize) -> Self

Construct a zero-width span at a single byte offset, useful for errors at EOF or between tokens.

Trait Implementations

impl Clone for Span

fn clone(&self) -> Span

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Span

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

Formats the value using the given formatter.

impl PartialEq for Span

fn eq(&self, other: &Span) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Span

impl Eq for Span

impl StructuralPartialEq for Span