Enum syntax::ast::PatKind

pub enum PatKind {
    Wild,
    Ident(BindingMode, Ident, Option<P<Pat>>),
    Struct(Path, Vec<Spanned<FieldPat>>, bool),
    TupleStruct(Path, Vec<P<Pat>>, Option<usize>),
    Path(Option<QSelf>, Path),
    Tuple(Vec<P<Pat>>, Option<usize>),
    Box(P<Pat>),
    Ref(P<Pat>, Mutability),
    Lit(P<Expr>),
    Range(P<Expr>, P<Expr>, Spanned<RangeEnd>),
    Slice(Vec<P<Pat>>, Option<P<Pat>>, Vec<P<Pat>>),
    Paren(P<Pat>),
    Mac(Mac),
}

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Variants

Wild

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Represents a wildcard pattern (_)

Ident(BindingMode, Ident, Option<P<Pat>>)

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A PatKind::Ident may either be a new bound variable (ref mut binding @ OPT_SUBPATTERN), or a unit struct/variant pattern, or a const pattern (in the last two cases the third field must be None). Disambiguation cannot be done with parser alone, so it happens during name resolution.

Struct(Path, Vec<Spanned<FieldPat>>, bool)

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A struct or struct variant pattern, e.g. Variant {x, y, ..}. The bool is true in the presence of a ...

TupleStruct(Path, Vec<P<Pat>>, Option<usize>)

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A tuple struct/variant pattern Variant(x, y, .., z). If the .. pattern fragment is present, then Option<usize> denotes its position. 0 <= position <= subpats.len()

Path(Option<QSelf>, Path)

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A possibly qualified path pattern. Unqualified path patterns A::B::C can legally refer to variants, structs, constants or associated constants. Qualified path patterns <A>::B::C/<A as Trait>::B::C can only legally refer to associated constants.

Tuple(Vec<P<Pat>>, Option<usize>)

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A tuple pattern (a, b). If the .. pattern fragment is present, then Option<usize> denotes its position. 0 <= position <= subpats.len()

Box(P<Pat>)

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A box pattern

Ref(P<Pat>, Mutability)

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A reference pattern, e.g. &mut (a, b)

Lit(P<Expr>)

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A literal

Range(P<Expr>, P<Expr>, Spanned<RangeEnd>)

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A range pattern, e.g. 1...2, 1..=2 or 1..2

Slice(Vec<P<Pat>>, Option<P<Pat>>, Vec<P<Pat>>)

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[a, b, ..i, y, z] is represented as: PatKind::Slice(box [a, b], Some(i), box [y, z])

Paren(P<Pat>)

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Parentheses in patters used for grouping, i.e. (PAT).

Mac(Mac)

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A macro pattern; pre-expansion

Trait Implementations

impl Clone for PatKind

fn clone(&self) -> PatKind

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Encodable for PatKind

fn encode<__S: Encoder>(&self, s: &mut __S) -> Result<(), __S::Error>

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impl Decodable for PatKind

fn decode<__D: Decoder>(d: &mut __D) -> Result<PatKind, __D::Error>

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impl Debug for PatKind

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

Formats the value using the given formatter.