# Struct rustc_hir_typeck::cast::CastCheck

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    pub struct CastCheck<'tcx> {
        expr: &'tcx Expr<'tcx>,
        expr_ty: Ty<'tcx>,
        expr_span: Span,
        cast_ty: Ty<'tcx>,
        cast_span: Span,
        span: Span,
        pub constness: Constness,
    }

Expand description

Reifies a cast check to be checked once we have full type information for a function context.

## Fields§

§`expr: &'tcx Expr<'tcx>`

The expression whose value is being casted

§`expr_ty: Ty<'tcx>`

The source type for the cast expression

§`expr_span: Span`§`cast_ty: Ty<'tcx>`

The target type. That is, the type we are casting to.

§`cast_span: Span`§`span: Span`§`constness: Constness`

whether the cast is made in a const context or not.

## Implementations§

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### impl<'a, 'tcx> CastCheck<'tcx>

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#### pub fn new( fcx: &FnCtxt<'a, 'tcx>, expr: &'tcx Expr<'tcx>, expr_ty: Ty<'tcx>, cast_ty: Ty<'tcx>, cast_span: Span, span: Span, constness: Constness ) -> Result<CastCheck<'tcx>, ErrorGuaranteed>

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#### fn report_cast_error(&self, fcx: &FnCtxt<'a, 'tcx>, e: CastError)

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#### fn report_cast_to_unsized_type(&self, fcx: &FnCtxt<'a, 'tcx>) -> ErrorGuaranteed

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#### fn trivial_cast_lint(&self, fcx: &FnCtxt<'a, 'tcx>)

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#### pub fn check(self, fcx: &FnCtxt<'a, 'tcx>)

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#### pub fn do_check(&self, fcx: &FnCtxt<'a, 'tcx>) -> Result<CastKind, CastError>

Checks a cast, and report an error if one exists. In some cases, this can return Ok and create type errors in the fcx rather than returning directly. coercion-cast is handled in check instead of here.

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#### fn check_ptr_ptr_cast( &self, fcx: &FnCtxt<'a, 'tcx>, m_expr: TypeAndMut<'tcx>, m_cast: TypeAndMut<'tcx> ) -> Result<CastKind, CastError>

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#### fn check_fptr_ptr_cast( &self, fcx: &FnCtxt<'a, 'tcx>, m_cast: TypeAndMut<'tcx> ) -> Result<CastKind, CastError>

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#### fn check_ptr_addr_cast( &self, fcx: &FnCtxt<'a, 'tcx>, m_expr: TypeAndMut<'tcx> ) -> Result<CastKind, CastError>

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#### fn check_ref_cast( &self, fcx: &FnCtxt<'a, 'tcx>, m_expr: TypeAndMut<'tcx>, m_cast: TypeAndMut<'tcx> ) -> Result<CastKind, CastError>

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#### fn check_addr_ptr_cast( &self, fcx: &FnCtxt<'a, 'tcx>, m_cast: TypeAndMut<'tcx> ) -> Result<CastKind, CastError>

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#### fn try_coercion_cast( &self, fcx: &FnCtxt<'a, 'tcx> ) -> Result<(), TypeError<'tcx>>

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#### fn cenum_impl_drop_lint(&self, fcx: &FnCtxt<'a, 'tcx>)

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#### fn lossy_provenance_ptr2int_lint(&self, fcx: &FnCtxt<'a, 'tcx>, t_c: IntTy)

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#### fn fuzzy_provenance_int2ptr_lint(&self, fcx: &FnCtxt<'a, 'tcx>)

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#### fn try_suggest_collection_to_bool( &self, fcx: &FnCtxt<'a, 'tcx>, err: &mut Diag<'_> )

Attempt to suggest using `.is_empty` when trying to cast from a collection type to a boolean.

## Trait Implementations§

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### impl<'tcx> Debug for CastCheck<'tcx>

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

Formats the value using the given formatter. Read more

## Auto Trait Implementations§

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### impl<'tcx> DynSend for CastCheck<'tcx>

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### impl<'tcx> DynSync for CastCheck<'tcx>

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### impl<'tcx> Freeze for CastCheck<'tcx>

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### impl<'tcx> !RefUnwindSafe for CastCheck<'tcx>

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### impl<'tcx> Send for CastCheck<'tcx>

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### impl<'tcx> Sync for CastCheck<'tcx>

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### impl<'tcx> Unpin for CastCheck<'tcx>

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### impl<'tcx> !UnwindSafe for CastCheck<'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<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<P> IntoQueryParam<P> for P

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#### fn into_query_param(self) -> 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> 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<'tcx, T> ToPredicate<'tcx, T> for T

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#### fn to_predicate(self, _tcx: TyCtxt<'tcx>) -> T

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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<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
where T: Send + Sync,

## 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: 56 bytes