Enum CharLitError 

pub enum CharLitError {
    Unterminated,
    Empty,
    TooLong,
}

Why a '…' run is not a character literal.

Three variants rather than one, because the lexer’s message is what makes the difference between the three legible: '' names no character, 'ab' names two, and 'a never closed. Collapsing them would report the length rule for a literal whose real problem is a missing quote.

Variants

Unterminated

No closing ' — the token ran to the end of its line or the file.

Empty

'': the body is empty, so there is no character to name.

TooLong

'ab': the body decodes to more than one Unicode scalar.

This is the variant the feature exists for. "ab"[0] is a well-typed program that silently means a; 'ab' is a lexical error.

Trait Implementations

impl Clone for CharLitError

fn clone(&self) -> CharLitError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CharLitError

impl Debug for CharLitError

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

Formats the value using the given formatter.

impl Eq for CharLitError

impl PartialEq for CharLitError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for CharLitError