Struct RecAscription 

pub struct RecAscription {
    pub colon: ColonTok,
    pub ty: TypeExpr,
}

A let-rec binding’s optional : ty ascription (see RecBinding’s doc comment). A direct (non-erased) TypeExpr field: RecBinding is already inside this #[recurse] module (embedded directly by Expr::LetRecIn, not through an eraser), and connecting it straight to TypeExpr — one of the module’s three self-recursive SCC roots — is exactly the same kind of cross-root DAG edge RecBinding.params: Vec<PatBot> already makes to the PatBot root; TypeExpr never refers back to Expr/PatBot/RecBinding, so no new cycle results.

Fields

colon: ColonTok

ty: TypeExpr

Trait Implementations

impl Clone for RecAscription

fn clone(&self) -> RecAscription

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RecAscription

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

Formats the value using the given formatter.

impl<__SyanMacro_Atom> Parse<__SyanMacro_Atom> for RecAscription

where __SyanMacro_Atom: Spanned + Clone, ColonTok: Parse<__SyanMacro_Atom>, TypeExpr: 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 RecAscription

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for RecAscription

impl<__SyanMacro_Atom> Unparse<__SyanMacro_Atom> for RecAscription

where ColonTok: Unparse<__SyanMacro_Atom>, TypeExpr: Unparse<__SyanMacro_Atom>,

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