Enum rustc_middle::thir::PatKind

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pub enum PatKind<'tcx> {
Show 15 variants Wild, AscribeUserType { ascription: Ascription<'tcx>, subpattern: Box<Pat<'tcx>>, }, Binding { name: Symbol, mode: BindingMode, var: LocalVarId, ty: Ty<'tcx>, subpattern: Option<Box<Pat<'tcx>>>, is_primary: bool, }, Variant { adt_def: AdtDef<'tcx>, args: GenericArgsRef<'tcx>, variant_index: VariantIdx, subpatterns: Vec<FieldPat<'tcx>>, }, Leaf { subpatterns: Vec<FieldPat<'tcx>>, }, Deref { subpattern: Box<Pat<'tcx>>, }, DerefPattern { subpattern: Box<Pat<'tcx>>, mutability: Mutability, }, Constant { value: Const<'tcx>, }, InlineConstant { def: LocalDefId, subpattern: Box<Pat<'tcx>>, }, Range(Box<PatRange<'tcx>>), Slice { prefix: Box<[Box<Pat<'tcx>>]>, slice: Option<Box<Pat<'tcx>>>, suffix: Box<[Box<Pat<'tcx>>]>, }, Array { prefix: Box<[Box<Pat<'tcx>>]>, slice: Option<Box<Pat<'tcx>>>, suffix: Box<[Box<Pat<'tcx>>]>, }, Or { pats: Box<[Box<Pat<'tcx>>]>, }, Never, Error(ErrorGuaranteed),
}

Variants§

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Wild

A wildcard pattern: _.

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AscribeUserType

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§ascription: Ascription<'tcx>
§subpattern: Box<Pat<'tcx>>
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Binding

x, ref x, x @ P, etc.

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§name: Symbol
§ty: Ty<'tcx>
§subpattern: Option<Box<Pat<'tcx>>>
§is_primary: bool

Is this the leftmost occurrence of the binding, i.e., is var the HirId of this pattern?

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Variant

Foo(...) or Foo{...} or Foo, where Foo is a variant name from an ADT with multiple variants.

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§adt_def: AdtDef<'tcx>
§args: GenericArgsRef<'tcx>
§variant_index: VariantIdx
§subpatterns: Vec<FieldPat<'tcx>>
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Leaf

(...), Foo(...), Foo{...}, or Foo, where Foo is a variant name from an ADT with a single variant.

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§subpatterns: Vec<FieldPat<'tcx>>
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Deref

box P, &P, &mut P, etc.

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§subpattern: Box<Pat<'tcx>>
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DerefPattern

Deref pattern, written box P for now.

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§subpattern: Box<Pat<'tcx>>
§mutability: Mutability
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Constant

One of the following:

  • &str (represented as a valtree), which will be handled as a string pattern and thus exhaustiveness checking will detect if you use the same string twice in different patterns.
  • integer, bool, char or float (represented as a valtree), which will be handled by exhaustiveness to cover exactly its own value, similar to &str, but these values are much simpler.
  • Opaque constants (represented as mir::ConstValue), that must not be matched structurally. So anything that does not derive PartialEq and Eq.

These are always compared with the matched place using (the semantics of) PartialEq.

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§value: Const<'tcx>
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InlineConstant

Inline constant found while lowering a pattern.

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§def: LocalDefId

LocalDefId of the constant, we need this so that we have a reference that can be used by unsafety checking to visit nested unevaluated constants.

§subpattern: Box<Pat<'tcx>>

If the inline constant is used in a range pattern, this subpattern represents the range (if both ends are inline constants, there will be multiple InlineConstant wrappers).

Otherwise, the actual pattern that the constant lowered to. As with other constants, inline constants are matched structurally where possible.

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Range(Box<PatRange<'tcx>>)

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Slice

Matches against a slice, checking the length and extracting elements. irrefutable when there is a slice pattern and both prefix and suffix are empty. e.g., &[ref xs @ ..].

Fields

§prefix: Box<[Box<Pat<'tcx>>]>
§slice: Option<Box<Pat<'tcx>>>
§suffix: Box<[Box<Pat<'tcx>>]>
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Array

Fixed match against an array; irrefutable.

Fields

§prefix: Box<[Box<Pat<'tcx>>]>
§slice: Option<Box<Pat<'tcx>>>
§suffix: Box<[Box<Pat<'tcx>>]>
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Or

An or-pattern, e.g. p | q. Invariant: pats.len() >= 2.

Fields

§pats: Box<[Box<Pat<'tcx>>]>
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Never

A never pattern !.

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Error(ErrorGuaranteed)

An error has been encountered during lowering. We probably shouldn’t report more lints related to this pattern.

Trait Implementations§

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impl<'tcx> Clone for PatKind<'tcx>

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

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<'tcx> Debug for PatKind<'tcx>

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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<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for PatKind<'tcx>

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fn hash_stable( &self, __hcx: &mut StableHashingContext<'__ctx>, __hasher: &mut StableHasher, )

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impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for PatKind<'tcx>

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fn visit_with<__V: TypeVisitor<TyCtxt<'tcx>>>( &self, __visitor: &mut __V, ) -> __V::Result

The entry point for visiting. To visit a value t with a visitor v call: t.visit_with(v). Read more

Auto Trait Implementations§

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impl<'tcx> Freeze for PatKind<'tcx>

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impl<'tcx> !RefUnwindSafe for PatKind<'tcx>

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impl<'tcx> !Send for PatKind<'tcx>

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impl<'tcx> !Sync for PatKind<'tcx>

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impl<'tcx> Unpin for PatKind<'tcx>

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impl<'tcx> !UnwindSafe for PatKind<'tcx>

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<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, R> CollectAndApply<T, R> for T

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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impl<Tcx, T> DepNodeParams<Tcx> for T
where Tcx: DepContext, T: for<'a> HashStable<StableHashingContext<'a>> + Debug,

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default fn fingerprint_style() -> FingerprintStyle

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default fn to_fingerprint(&self, tcx: Tcx) -> Fingerprint

This method turns the parameters of a DepNodeConstructor into an opaque Fingerprint to be used in DepNode. Not all DepNodeParams support being turned into a Fingerprint (they don’t need to if the corresponding DepNode is anonymous).
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default fn to_debug_str(&self, _: Tcx) -> String

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default fn recover(_: Tcx, _: &DepNode) -> Option<T>

This method tries to recover the query key from the given DepNode, something which is needed when forcing DepNodes during red-green evaluation. The query system will only call this method if fingerprint_style() is not FingerprintStyle::Opaque. It is always valid to return None here, in which case incremental compilation will treat the query as having changed instead of forcing it.
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impl<T> Filterable for T

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fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. 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<P> IntoQueryParam<P> for P

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impl<T> MaybeResult<T> for T

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type Error = !

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fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

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fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

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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<I, T> TypeVisitableExt<I> for T
where I: Interner, T: TypeVisitable<I>,

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fn has_type_flags(&self, flags: TypeFlags) -> bool

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fn has_vars_bound_at_or_above(&self, binder: DebruijnIndex) -> bool

Returns true if self has any late-bound regions that are either bound by binder or bound by some binder outside of binder. If binder is ty::INNERMOST, this indicates whether there are any late-bound regions that appear free.
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fn error_reported(&self) -> Result<(), <I as Interner>::ErrorGuaranteed>

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fn has_vars_bound_above(&self, binder: DebruijnIndex) -> bool

Returns true if this type has any regions that escape binder (and hence are not bound by it).
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fn has_escaping_bound_vars(&self) -> bool

Return true if this type has regions that are not a part of the type. For example, for<'a> fn(&'a i32) return false, while fn(&'a i32) would return true. The latter can occur when traversing through the former. Read more
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fn has_aliases(&self) -> bool

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fn has_inherent_projections(&self) -> bool

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fn has_opaque_types(&self) -> bool

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fn has_coroutines(&self) -> bool

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fn references_error(&self) -> bool

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fn has_non_region_param(&self) -> bool

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fn has_infer_regions(&self) -> bool

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fn has_infer_types(&self) -> bool

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fn has_non_region_infer(&self) -> bool

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fn has_infer(&self) -> bool

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fn has_placeholders(&self) -> bool

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fn has_non_region_placeholders(&self) -> bool

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fn has_param(&self) -> bool

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fn has_free_regions(&self) -> bool

“Free” regions in this context means that it has any region that is not (a) erased or (b) late-bound.
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fn has_erased_regions(&self) -> bool

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fn has_erasable_regions(&self) -> bool

True if there are any un-erased free regions.
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fn is_global(&self) -> bool

Indicates whether this value references only ‘global’ generic parameters that are the same regardless of what fn we are in. This is used for caching.
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fn has_bound_regions(&self) -> bool

True if there are any late-bound regions
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fn has_non_region_bound_vars(&self) -> bool

True if there are any late-bound non-region variables
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fn has_bound_vars(&self) -> bool

True if there are any bound variables
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fn still_further_specializable(&self) -> bool

Indicates whether this value still has parameters/placeholders/inference variables which could be replaced later, in a way that would change the results of impl specialization.
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impl<I, T, U> Upcast<I, U> for T
where U: UpcastFrom<I, T>,

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fn upcast(self, interner: I) -> U

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impl<I, T> UpcastFrom<I, T> for T

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fn upcast_from(from: T, _tcx: I) -> T

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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<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

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default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed, ) -> T

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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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impl<T> ErasedDestructor for T
where T: 'static,

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impl<T> MaybeSendSync for T

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
  • AscribeUserType: 48 bytes
  • Binding: 40 bytes
  • Variant: 48 bytes
  • Leaf: 32 bytes
  • Deref: 16 bytes
  • DerefPattern: 24 bytes
  • Constant: 48 bytes
  • InlineConstant: 24 bytes
  • Range: 16 bytes
  • Slice: 48 bytes
  • Array: 48 bytes
  • Or: 24 bytes
  • Never: 0 bytes
  • Error: 0 bytes