[−][src]Enum syntax::ast::PatKind
Variants
Wild
Represents a wildcard pattern (_
).
Ident(BindingMode, Ident, 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>, Spanned<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 patterns 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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fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source
. Read more
impl Debug for PatKind
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impl Encodable for PatKind
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impl Decodable for PatKind
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Auto Trait Implementations
Blanket Implementations
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
fn to_owned(&self) -> T
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fn clone_into(&self, target: &mut T)
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impl<T> From for T
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impl<T, U> Into for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T> Borrow for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T, U> TryInto for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Encodable for T where
T: UseSpecializedEncodable + ?Sized,
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T: UseSpecializedEncodable + ?Sized,
impl<T> Decodable for T where
T: UseSpecializedDecodable,
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T: UseSpecializedDecodable,
impl<E> SpecializationError for E
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default fn not_found<S, T>(
trait_name: &'static str,
method_name: &'static str
) -> E where
T: ?Sized,
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trait_name: &'static str,
method_name: &'static str
) -> E where
T: ?Sized,
impl<T> Send for T where
T: ?Sized,
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T: ?Sized,
impl<T> Sync for T where
T: ?Sized,
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T: ?Sized,