Enum rustc_hir::PatKind

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pub enum PatKind<'hir> {
    Wild,
    Binding(BindingAnnotation, HirId, Ident, Option<&'hir Pat<'hir>>),
    Struct(QPath<'hir>, &'hir [PatField<'hir>], bool),
    TupleStruct(QPath<'hir>, &'hir [Pat<'hir>], DotDotPos),
    Or(&'hir [Pat<'hir>]),
    Path(QPath<'hir>),
    Tuple(&'hir [Pat<'hir>], DotDotPos),
    Box(&'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>]),
}

Variants§

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Wild

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

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Binding(BindingAnnotation, 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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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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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)])

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> 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> Any for Twhere 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 Twhere 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 Twhere 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 Twhere 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, U> Into<U> for Twhere 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> ToOwned for Twhere 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 Twhere 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 Twhere 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.

Layout§

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
  • Path: 31 bytes
  • Tuple: 23 bytes
  • Box: 15 bytes
  • Ref: 15 bytes
  • Lit: 15 bytes
  • Range: 23 bytes
  • Slice: 47 bytes