Struct Param 

pub struct Param {
    pub opts: Option<OptParamsV1>,
    pub body: ParamBody,
}

One param_unit (parser_v1.mly:635-646): an optional ?(l = x, …) labeled-optional binder bundle, then a ParamBody (a plain patbot, or a ( pat : τ ) ascribed pattern). Held inside mod ast (re-exported at super::Param) so the roots that carry param lists (Expr::Fun/Expr::LetIn/RecClauseV1) reference it without a boundary Parse-trait cycle. A bare patbot param parses Param { opts: None, body: ParamBody::Pat(_) } directly — the ?-headed opts Option is tried first, failing on a non-? head with no token stolen, so an all-plain param list parses unchanged.

Fields

opts: Option<OptParamsV1>

body: ParamBody

Trait Implementations

impl Clone for Param

fn clone(&self) -> Param

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Param

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

Formats the value using the given formatter.

impl<__SyanMacro_Atom> Parse<__SyanMacro_Atom> for Param

where __SyanMacro_Atom: Spanned + Clone, Option<OptParamsV1>: Parse<__SyanMacro_Atom>, ParamBody: 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 Param

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Param

impl<__SyanMacro_Atom> Unparse<__SyanMacro_Atom> for Param

where Option<OptParamsV1>: Unparse<__SyanMacro_Atom>, ParamBody: Unparse<__SyanMacro_Atom>,

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