Enum ParamBody 

pub enum ParamBody {
    Pat(PatBot),
    Ascribed {
        paren: ParenGroup<()>,
        inner: AscribedInnerV1,
    },
}

A param_unit’s trailing shape (parser_v1.mly:635-646): either a plain patbot, or a ( pattern : typ ) ascribed pattern (parser_v1.mly:641-645).

Variants

Pat(PatBot)

Tried FIRST: ( x : int ) fails patbot’s own paren body at the : (a patbot paren group expects only more patterns/,/)) and backtracks to Ascribed cleanly (ordered choice, no token stolen).

Ascribed

( pattern : typ ) — a FULL pattern (not patbot) ascribed with a full typ, both via erasers (same cycle-avoidance discipline as every other satellite in this module).

Fields

paren: ParenGroup<()>

inner: AscribedInnerV1

Trait Implementations

impl Clone for ParamBody

fn clone(&self) -> ParamBody

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ParamBody

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

Formats the value using the given formatter.

impl<__SyanMacro_Atom> Parse<__SyanMacro_Atom> for ParamBody

where __SyanMacro_Atom: Spanned + Clone, PatBot: Parse<__SyanMacro_Atom>, ParenGroup<()>: GroupShape<__SyanMacro_Atom>, __SyanSubstructOfOwn_paren_ParamBody_Ascribed_1383305089136131385: 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 ParamBody

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ParamBody

impl<__SyanMacro_Atom> Unparse<__SyanMacro_Atom> for ParamBody

where PatBot: Unparse<__SyanMacro_Atom>, ParenGroup<()>: GroupUnparse<__SyanMacro_Atom>, for<'syan_substruct_ref> __SyanSubstructOfRef_paren_ParamBody_Ascribed_1383305089136131385<'syan_substruct_ref>: Unparse<__SyanMacro_Atom>,

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