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CmdTail

Enum CmdTail 

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pub enum CmdTail {
    Semi(EndActiveTok),
    Args {
        lead_opts: Option<OptArgsV1>,
        args: ExprErasedV1,
        semi: Option<EndActiveTok>,
    },
}
Expand description

A command’s arguments — identical shape to crate::cst::ast::CmdTail0.1 delta: an optional LEADING ?(l = e, …) bundle. A command applied with an optional on its FIRST argument (\cmd ?(l = e){arg}, +sec ?(label = t){title}<body> — the ONLY shape the capstone census finds) can’t ride inside args (an expr_app application chain whose head must be a bare Atomic, never a ?-headed bundle — the head slot has no place for a leading bundle), so it is peeled off here as lead_opts and re-attached to the first argument at lowering (v1::lower::lower_cmd_tail). A bundle on a LATER argument (\cmd{a} ?(l = e){b}) still rides inside args as an ordinary AppArg::Bundled. ?(-headed, token-disjoint from every args head shape, so a bundle-less tail parses lead_opts: None.

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Semi(EndActiveTok)

; — no arguments.

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Args

The argument chain, optionally prefixed by a leading ?(l = e, …) bundle on the first argument.

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impl Clone for CmdTail

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fn clone(&self) -> CmdTail

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Debug for CmdTail

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

Formats the value using the given formatter. Read more
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impl<__SyanMacro_Atom> Parse<__SyanMacro_Atom> for CmdTail
where __SyanMacro_Atom: Spanned + Clone, EndActiveTok: Parse<__SyanMacro_Atom>, Option<OptArgsV1>: Parse<__SyanMacro_Atom>, ExprErasedV1: Parse<__SyanMacro_Atom>, Option<EndActiveTok>: Parse<__SyanMacro_Atom>,

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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.
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fn parse_stream<__SyanMacro_S: ParseStream<Atom = __SyanMacro_Atom>>( __syan_stream: &mut __SyanMacro_S, ) -> Result<Self, Self::Error>

Parse from a reborrowable stream. Read more
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fn parse(stream: impl IntoParseStream<Atom = Atom>) -> Result<Self, Self::Error>

Parse from anything that can become a stream — String, TokenStream, an existing stream. Read more
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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).
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impl PartialEq for CmdTail

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

Equality operator ==. Read more
1.0.0 (const: unstable) · Source§

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

Inequality operator !=. Read more
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impl StructuralPartialEq for CmdTail

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impl<__SyanMacro_Atom> Unparse<__SyanMacro_Atom> for CmdTail
where EndActiveTok: Unparse<__SyanMacro_Atom>, Option<OptArgsV1>: Unparse<__SyanMacro_Atom>, ExprErasedV1: Unparse<__SyanMacro_Atom>, Option<EndActiveTok>: Unparse<__SyanMacro_Atom>,

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

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> Clone for T
where T: Clone,

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fn clone(&self) -> T

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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> Debug for T
where T: Debug,

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

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.