Enum ParseFailureKind 

pub enum ParseFailureKind {
    Lex,
    Syntax,
    GaveUp,
}

What kind of failure a ParseFileError reports.

The distinction that earns this type is Self::GaveUp: a parse stopped by crate::stream::Budget has established nothing about the source, and must not be presented as though it had.

Variants

Lex

The lexer rejected the characters. These already carry a hand-written message and a tight span, and are passed through untouched.

Syntax

The grammar rejected the token stream. ParseFileError::span is the token the parse could not get past.

GaveUp

The parse ran out of backtracking budget before reaching any verdict. ParseFileError::span is the furthest token it reached, which is where an unfinished construct usually is — but the file may well be valid, and this is not a claim that it is not.

Trait Implementations

impl Clone for ParseFailureKind

fn clone(&self) -> ParseFailureKind

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ParseFailureKind

impl Debug for ParseFailureKind

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

Formats the value using the given formatter.

impl Eq for ParseFailureKind

impl PartialEq for ParseFailureKind

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ParseFailureKind