Struct rustc_hir::hir::Pat

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pub struct Pat<'hir> {
    pub hir_id: HirId,
    pub kind: PatKind<'hir>,
    pub span: Span,
    pub default_binding_modes: bool,
}

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§hir_id: HirId§kind: PatKind<'hir>§span: Span§default_binding_modes: bool

Whether to use default binding modes. At present, this is false only for destructuring assignment.

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impl<'hir> Pat<'hir>

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fn walk_short_(&self, it: &mut impl FnMut(&Pat<'hir>) -> bool) -> bool

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pub fn walk_short(&self, it: impl FnMut(&Pat<'hir>) -> bool) -> bool

Walk the pattern in left-to-right order, short circuiting (with .all(..)) if false is returned.

Note that when visiting e.g. Tuple(ps), if visiting ps[0] returns false, then ps[1] will not be visited.

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fn walk_(&self, it: &mut impl FnMut(&Pat<'hir>) -> bool)

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pub fn walk(&self, it: impl FnMut(&Pat<'hir>) -> bool)

Walk the pattern in left-to-right order.

If it(pat) returns false, the children are not visited.

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pub fn walk_always(&self, it: impl FnMut(&Pat<'_>))

Walk the pattern in left-to-right order.

If you always want to recurse, prefer this method over walk.

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pub fn is_never_pattern(&self) -> bool

Whether this a never pattern.

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impl Pat<'_>

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pub fn each_binding(&self, f: impl FnMut(BindingMode, HirId, Span, Ident))

Call f on every “binding” in a pattern, e.g., on a in match foo() { Some(a) => (), None => () }

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pub fn each_binding_or_first( &self, f: &mut impl FnMut(BindingMode, HirId, Span, Ident) )

Call f on every “binding” in a pattern, e.g., on a in match foo() { Some(a) => (), None => () }.

When encountering an or-pattern p_0 | ... | p_n only the first non-never pattern will be visited. If they’re all never patterns we visit nothing, which is ok since a never pattern cannot have bindings.

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pub fn simple_ident(&self) -> Option<Ident>

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pub fn necessary_variants(&self) -> Vec<DefId>

Returns variants that are necessary to exist for the pattern to match.

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pub fn contains_explicit_ref_binding(&self) -> Option<Mutability>

Checks if the pattern contains any ref or ref mut bindings, and if yes whether it contains mutable or just immutables ones.

Trait Implementations§

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impl<'hir> Clone for Pat<'hir>

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

Auto Trait Implementations§

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impl<'hir> DynSend for Pat<'hir>

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impl<'hir> DynSync for Pat<'hir>

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impl<'hir> Freeze for Pat<'hir>

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impl<'hir> RefUnwindSafe for Pat<'hir>

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impl<'hir> Send for Pat<'hir>

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impl<'hir> Sync for Pat<'hir>

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impl<'hir> Unpin for Pat<'hir>

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impl<'hir> UnwindSafe for Pat<'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> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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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,

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: 72 bytes