Enum MathArg 

pub enum MathArg {
    Optional {
        q: OptionalTok,
        body: MathArgBody,
    },
    Omission(OmissionTok),
    Plain(MathArgBody),
}

matharg (parser.mly:1138-1146 + narg 1201-1210): one math-mode command argument — a mandatory body, a ?:-supplied optional (UTOptionalArgument), or ?* (UTOmission). The six body shapes live once in MathArgBody; Optional/Omission/Plain are first-token-disjoint.

Variants

Optional

Fields

q: OptionalTok

body: MathArgBody

Omission(OmissionTok)

Plain(MathArgBody)

Trait Implementations

impl Clone for MathArg

fn clone(&self) -> MathArg

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MathArg

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

Formats the value using the given formatter.

impl<__SyanMacro_Atom> Parse<__SyanMacro_Atom> for MathArg

where __SyanMacro_Atom: Spanned + Clone, OptionalTok: Parse<__SyanMacro_Atom>, MathArgBody: Parse<__SyanMacro_Atom>, OmissionTok: Parse<__SyanMacro_Atom>,

type Error = ParseError<<__SyanMacro_Atom as Spanned>::Span>

Every error must be convertible to the universal one, so a field’s failure can become the enclosing type’s failure with no per-field where-predicate. Stating it HERE rather than at each derived impl is what keeps it out of the obligation graph: a per-field <FieldTy as Parse<Atom>>::Error: Into<…> predicate re-creates a projection cycle on a recursive field (E0275), which decycle’s bound-peeling does not break.

fn parse_stream<__SyanMacro_S: ParseStream<Atom = __SyanMacro_Atom>>( __syan_stream: &mut __SyanMacro_S, ) -> Result<Self, Self::Error>

Parse from a reborrowable stream.

fn parse(stream: impl IntoParseStream<Atom = Atom>) -> Result<Self, Self::Error>

Parse from anything that can become a stream — String, TokenStream, an existing stream.

fn attempt(self) -> Attempt<Self>

Wrap this value in Attempt, the atomic-parse marker: parsing an Attempt<Self> parses Self but rewinds the stream on failure (it requires Atom: Clone). This is the value constructor; value.attempt() is sugar for Attempt(value).

impl PartialEq for MathArg

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for MathArg

impl<__SyanMacro_Atom> Unparse<__SyanMacro_Atom> for MathArg

where OptionalTok: Unparse<__SyanMacro_Atom>, MathArgBody: Unparse<__SyanMacro_Atom>, OmissionTok: Unparse<__SyanMacro_Atom>,

fn unparse<__Syan_Emitter: Emitter<__SyanMacro_Atom>>( &self, __syan_sink: &mut __Syan_Emitter, ) -> Result<(), <__Syan_Emitter as Emitter<__SyanMacro_Atom>>::Error>