Enum syn::Pat

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

Variants

Wild

Represents a wildcard pattern (_)

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

A Pat::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<FieldPat>, bool)

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

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

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)

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

Tuple(Vec<Pat>, Option<usize>)

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

Box(Box<Pat>)

A box pattern

Ref(Box<Pat>, Mutability)

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

Lit(Box<Expr>)

A literal

Range(Box<Expr>, Box<Expr>)

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

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

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

Mac(Mac)

A macro pattern; pre-expansion

Trait Implementations

impl ToTokens for Pat

fn to_tokens(&self, tokens: &mut Tokens)

Write self to the given Tokens.

impl Debug for Pat

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Clone for Pat

fn clone(&self) -> Pat

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Eq for Pat

impl PartialEq for Pat

fn eq(&self, __arg_0: &Pat) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, __arg_0: &Pat) -> bool

This method tests for !=.

impl Hash for Pat

fn hash<__H: Hasher>(&self, __arg_0: &mut __H)

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given [Hasher].