Struct TypeCmdArgItem 

pub struct TypeCmdArgItem {
    pub opt_labels: Vec<TypeCmdOptField>,
    pub ty: TyErased,
    pub opt: Option<OptionalTypeTok>,
    pub semi: Option<ListPunctTok>,
}

One ;-separated element of a TypeAtom::Cmd’s bracketed argument list: a mandatory ty, or an optional ty? (parser.mly’s txlist, 955-960) — routed through super::TyErased rather than the narrower TypeApp upstream uses, both to stay a DAG leaf (a direct TypeApp field here would close TypeAtom -> Cmd -> ... -> TypeApp -> TypeAtom, a fresh cycle through non-root types — see AppArgErased’s doc comment for the identical hazard) and per this port’s usual permissive-superset simplification.

opt_labels is the lowered ?(l:τ,…) command-type row PREFIX on this slot (TypeCmdOptDomV1 at the cst_v1 side): a flat list of label : ty fields, no wrapping ?( sigil/group of its own at this (already-lowered) target — purely a data carrier, populated by v1/lower.rs::lower_type_cmd_args and read by typecheck.rs’s lower_type_atom Cmd arm. Every 0.0.6-parsed fixture yields opt_labels == []: no real 0.0.6 TypeCmdArgItem position can contain a bare label : shape (0.0.6’s grammar has no colon here at all).

Fields

opt_labels: Vec<TypeCmdOptField>

ty: TyErased

opt: Option<OptionalTypeTok>

semi: Option<ListPunctTok>

Trait Implementations

impl Clone for TypeCmdArgItem

fn clone(&self) -> TypeCmdArgItem

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TypeCmdArgItem

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

Formats the value using the given formatter.

impl<__SyanMacro_Atom> Parse<__SyanMacro_Atom> for TypeCmdArgItem

where __SyanMacro_Atom: Spanned + Clone, Vec<TypeCmdOptField>: Parse<__SyanMacro_Atom>, TyErased: Parse<__SyanMacro_Atom>, Option<OptionalTypeTok>: Parse<__SyanMacro_Atom>, Option<ListPunctTok>: 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 TypeCmdArgItem

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for TypeCmdArgItem

impl<__SyanMacro_Atom> Unparse<__SyanMacro_Atom> for TypeCmdArgItem

where Vec<TypeCmdOptField>: Unparse<__SyanMacro_Atom>, TyErased: Unparse<__SyanMacro_Atom>, Option<OptionalTypeTok>: Unparse<__SyanMacro_Atom>, Option<ListPunctTok>: Unparse<__SyanMacro_Atom>,

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