Enum syntax::ast::PatKind
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pub enum PatKind { Wild, Ident(BindingMode, SpannedIdent, 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>, RangeEnd), Slice(Vec<P<Pat>>, Option<P<Pat>>, Vec<P<Pat>>), Paren(P<Pat>), Mac(Mac), }
Variants
Wild
Represents a wildcard pattern (_
)
Ident(BindingMode, SpannedIdent, Option<P<Pat>>)
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)
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>)
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.
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>)
A tuple pattern (a, b)
.
If the ..
pattern fragment is present, then Option<usize>
denotes its position.
0 <= position <= subpats.len()
Box(P<Pat>)
A box
pattern
Ref(P<Pat>, Mutability)
A reference pattern, e.g. &mut (a, b)
Lit(P<Expr>)
A literal
Range(P<Expr>, P<Expr>, RangeEnd)
A range pattern, e.g. 1...2
, 1..=2
or 1..2
Slice(Vec<P<Pat>>, Option<P<Pat>>, Vec<P<Pat>>)
[a, b, ..i, y, z]
is represented as:
PatKind::Slice(box [a, b], Some(i), box [y, z])
Paren(P<Pat>)
Parentheses in patters used for grouping, i.e. (PAT)
.
Mac(Mac)
A macro pattern; pre-expansion
Trait Implementations
impl Clone for PatKind
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fn clone(&self) -> PatKind
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Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
1.0.0[src]
Performs copy-assignment from source
. Read more
impl PartialEq for PatKind
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fn eq(&self, __arg_0: &PatKind) -> bool
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This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, __arg_0: &PatKind) -> bool
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This method tests for !=
.
impl Eq for PatKind
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impl Encodable for PatKind
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impl Decodable for PatKind
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impl Hash for PatKind
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fn hash<__H: Hasher>(&self, __arg_0: &mut __H)
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Feeds this value into the given [Hasher
]. Read more
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
1.3.0[src]
H: Hasher,
Feeds a slice of this type into the given [Hasher
]. Read more