Enum rustc_hir::hir::PatKind

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pub enum PatKind<'hir> {
Show 15 variants Wild, Binding(BindingMode, HirId, Ident, Option<&'hir Pat<'hir>>), Struct(QPath<'hir>, &'hir [PatField<'hir>], bool), TupleStruct(QPath<'hir>, &'hir [Pat<'hir>], DotDotPos), Or(&'hir [Pat<'hir>]), Never, Path(QPath<'hir>), Tuple(&'hir [Pat<'hir>], DotDotPos), Box(&'hir Pat<'hir>), Deref(&'hir Pat<'hir>), Ref(&'hir Pat<'hir>, Mutability), Lit(&'hir Expr<'hir>), Range(Option<&'hir Expr<'hir>>, Option<&'hir Expr<'hir>>, RangeEnd), Slice(&'hir [Pat<'hir>], Option<&'hir Pat<'hir>>, &'hir [Pat<'hir>]), Err(ErrorGuaranteed),
}

Variants§

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Wild

Represents a wildcard pattern (i.e., _).

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Binding(BindingMode, HirId, Ident, Option<&'hir Pat<'hir>>)

A fresh binding ref mut binding @ OPT_SUBPATTERN. The HirId is the canonical ID for the variable being bound, (e.g., in Ok(x) | Err(x), both x use the same canonical ID), which is the pattern ID of the first x.

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Struct(QPath<'hir>, &'hir [PatField<'hir>], bool)

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

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TupleStruct(QPath<'hir>, &'hir [Pat<'hir>], DotDotPos)

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

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Or(&'hir [Pat<'hir>])

An or-pattern A | B | C. Invariant: pats.len() >= 2.

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Never

A never pattern !.

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Path(QPath<'hir>)

A path pattern for a unit struct/variant or a (maybe-associated) constant.

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Tuple(&'hir [Pat<'hir>], DotDotPos)

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

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Box(&'hir Pat<'hir>)

A box pattern.

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Deref(&'hir Pat<'hir>)

A deref pattern (currently deref!() macro-based syntax).

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Ref(&'hir Pat<'hir>, Mutability)

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

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Lit(&'hir Expr<'hir>)

A literal.

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Range(Option<&'hir Expr<'hir>>, Option<&'hir Expr<'hir>>, RangeEnd)

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

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Slice(&'hir [Pat<'hir>], Option<&'hir Pat<'hir>>, &'hir [Pat<'hir>])

A slice pattern, [before_0, ..., before_n, (slice, after_0, ..., after_n)?].

Here, slice is lowered from the syntax ($binding_mode $ident @)? ... If slice exists, then after can be non-empty.

The representation for e.g., [a, b, .., c, d] is:

PatKind::Slice([Binding(a), Binding(b)], Some(Wild), [Binding(c), Binding(d)])
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Err(ErrorGuaranteed)

A placeholder for a pattern that wasn’t well formed in some way.

Trait Implementations§

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impl<'hir> Clone for PatKind<'hir>

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fn clone(&self) -> PatKind<'hir>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<'hir> Debug for PatKind<'hir>

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

Formats the value using the given formatter. Read more
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impl<'hir, __CTX> HashStable<__CTX> for PatKind<'hir>
where __CTX: HashStableContext,

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fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)

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impl<'hir> Copy for PatKind<'hir>

Auto Trait Implementations§

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impl<'hir> DynSend for PatKind<'hir>

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impl<'hir> DynSync for PatKind<'hir>

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impl<'hir> Freeze for PatKind<'hir>

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impl<'hir> RefUnwindSafe for PatKind<'hir>

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impl<'hir> Send for PatKind<'hir>

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impl<'hir> Sync for PatKind<'hir>

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impl<'hir> Unpin for PatKind<'hir>

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impl<'hir> UnwindSafe for PatKind<'hir>

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for T
where T: Copy,

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fn allocate_on<'a>(self, arena: &'a Arena<'tcx>) -> &'a mut T

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fn allocate_from_iter<'a>( arena: &'a Arena<'tcx>, iter: impl IntoIterator<Item = T> ) -> &'a mut [T]

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<'a, T> Captures<'a> for T
where T: ?Sized,

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Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 48 bytes

Size for each variant:

  • Wild: 0 bytes
  • Binding: 31 bytes
  • Struct: 47 bytes
  • TupleStruct: 47 bytes
  • Or: 23 bytes
  • Never: 0 bytes
  • Path: 31 bytes
  • Tuple: 23 bytes
  • Box: 15 bytes
  • Deref: 15 bytes
  • Ref: 15 bytes
  • Lit: 15 bytes
  • Range: 23 bytes
  • Slice: 47 bytes
  • Err: 0 bytes