Struct PatNonVarErasedV1 

pub struct PatNonVarErasedV1(pub Box<Pattern>);

An ast::Pattern that is not a bare variable — upstream 0.1’s own pattern_non_var (parser_v1.mly:796), and the 0.1 twin of crate::cst::PatNonVarErased, whose doc comment carries the whole story.

0.1 blows up the same way and slightly harder: over a chain of let vN = N in ending in a broken let, 5,755 serves at 3, 46,971 at 6, 376,699 at 9, 3,014,523 at 12, 24,117,115 at 15 — the same ×2.000 per let, off a larger constant. [Expr::LetIn] subsumes every bare-variable target here too (its params is greedy but no Param begins with =), so refusing one costs nothing and makes the two let alternatives disjoint.

Tuple Fields

0: Box<Pattern>

Trait Implementations

impl Clone for PatNonVarErasedV1

fn clone(&self) -> PatNonVarErasedV1

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PatNonVarErasedV1

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

Formats the value using the given formatter.

impl Deref for PatNonVarErasedV1

where Box<Pattern>: Deref,

type Target = <Box<Pattern> as Deref>::Target

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl Deref for PatNonVarErasedV1

where Box<Pattern>: Deref,

impl Parse<WithSpan<Token, Span>> for PatNonVarErasedV1

type Error = ParseError<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<S: ParseStream<Atom = Atom>>( stream: &mut 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 PatNonVarErasedV1

fn eq(&self, other: &PatNonVarErasedV1) -> bool

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for PatNonVarErasedV1

impl Unparse<WithSpan<Token, Span>> for PatNonVarErasedV1

fn unparse<S: Emitter<Atom>>(&self, sink: &mut S) -> Result<(), S::Error>