Struct TopStage 

pub struct TopStage {
    pub persistent: Option<KwPersistent>,
    pub tilde: ExactTildeTok,
}

A binding’s own stage qualifier: ~ (stage 0) or persistent ~ (persistent stage), the prefix SATySFi 0.1 writes between val and the bound name (parser_v1.mly:417-421, UTBindValue(Stage0 | Persistent0, _); the absent prefix is Stage1, the document stage).

Spelled with tokens rather than a rustyfi_lang::types::Stage because this crate is the syntax layer and knows nothing of the type layer; elaborate.rs maps the pair to a Stage (top_let_stage).

persistent is a 0.1-only keyword (lexer.rs’s version-gated table), so under 0.0.6 the Some(_) shape is unreachable through the persistent spelling and reachable only as a bare let ~x = e — syntax upstream 0.0.6 does not have (its EXACT_TILDE is a splice operand prefix, v0.0.6 parser.mly:797, or macro syntax, :608/:1199 — never a binding qualifier). PARSING it under 0.0.6 is the usual additive-accept latitude this shared cst takes; ELABORATING it is not — elaborate.rs’s binding_stage refuses a stage qualifier on 0.0.6-authored input with a version error, so no 0.0.6 file can quietly acquire a per-binding stage.

Fields

persistent: Option<KwPersistent>

tilde: ExactTildeTok

Trait Implementations

impl Clone for TopStage

fn clone(&self) -> TopStage

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TopStage

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

Formats the value using the given formatter.

impl<__SyanMacro_Atom> Parse<__SyanMacro_Atom> for TopStage

where __SyanMacro_Atom: Spanned + Clone, Option<KwPersistent>: Parse<__SyanMacro_Atom>, ExactTildeTok: 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 TopStage

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for TopStage

impl<__SyanMacro_Atom> Unparse<__SyanMacro_Atom> for TopStage

where Option<KwPersistent>: Unparse<__SyanMacro_Atom>, ExactTildeTok: Unparse<__SyanMacro_Atom>,

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