struct MatchVisitor<'p, 'tcx> {
    tcx: TyCtxt<'tcx>,
    param_env: ParamEnv<'tcx>,
    typeck_results: &'tcx TypeckResults<'tcx>,
    thir: &'p Thir<'tcx>,
    lint_level: HirId,
    let_source: LetSource,
    pattern_arena: &'p TypedArena<DeconstructedPat<'p, 'tcx>>,
    dropless_arena: &'p DroplessArena,
    error: Result<(), ErrorGuaranteed>,
}

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§tcx: TyCtxt<'tcx>§param_env: ParamEnv<'tcx>§typeck_results: &'tcx TypeckResults<'tcx>§thir: &'p Thir<'tcx>§lint_level: HirId§let_source: LetSource§pattern_arena: &'p TypedArena<DeconstructedPat<'p, 'tcx>>§dropless_arena: &'p DroplessArena§error: Result<(), ErrorGuaranteed>

Tracks if we encountered an error while checking this body. That the first function to report it stores it here. Some functions return Result to allow callers to short-circuit on error, but callers don’t need to store it here again.

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impl<'p, 'tcx> MatchVisitor<'p, 'tcx>

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fn with_let_source(&mut self, let_source: LetSource, f: impl FnOnce(&mut Self))

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fn with_lint_level<T>( &mut self, new_lint_level: LintLevel, f: impl FnOnce(&mut Self) -> T ) -> T

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fn visit_land( &mut self, ex: &'p Expr<'tcx>, accumulator: &mut Vec<Option<(Span, RefutableFlag)>> ) -> Result<(), ErrorGuaranteed>

Visit a nested chain of &&. Used for if-let chains. This must call visit_expr on the subexpressions we are not handling ourselves.

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fn visit_land_rhs( &mut self, ex: &'p Expr<'tcx> ) -> Result<Option<(Span, RefutableFlag)>, ErrorGuaranteed>

Visit the right-hand-side of a &&. Used for if-let chains. Returns Some if the expression was ultimately a let ... = ..., and None if it was a normal boolean expression. This must call visit_expr on the subexpressions we are not handling ourselves.

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fn lower_pattern( &mut self, cx: &PatCtxt<'p, 'tcx>, pat: &'p Pat<'tcx> ) -> Result<&'p DeconstructedPat<'p, 'tcx>, ErrorGuaranteed>

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fn is_known_valid_scrutinee(&self, scrutinee: &Expr<'tcx>) -> bool

Inspects the match scrutinee expression to determine whether the place it evaluates to may hold invalid data.

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fn new_cx( &self, refutability: RefutableFlag, whole_match_span: Option<Span>, scrutinee: Option<&Expr<'tcx>>, scrut_span: Span ) -> PatCtxt<'p, 'tcx>

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fn analyze_patterns( &mut self, cx: &PatCtxt<'p, 'tcx>, arms: &[MatchArm<'p, 'tcx>], scrut_ty: Ty<'tcx> ) -> Result<UsefulnessReport<'p, 'tcx>, ErrorGuaranteed>

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fn check_let( &mut self, pat: &'p Pat<'tcx>, scrutinee: Option<ExprId>, span: Span )

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fn check_match( &mut self, scrut: ExprId, arms: &[ArmId], source: MatchSource, expr_span: Span )

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fn check_let_chain( &mut self, chain_refutabilities: Vec<Option<(Span, RefutableFlag)>>, whole_chain_span: Span )

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fn analyze_binding( &mut self, pat: &'p Pat<'tcx>, refutability: RefutableFlag, scrut: Option<&Expr<'tcx>> ) -> Result<(PatCtxt<'p, 'tcx>, UsefulnessReport<'p, 'tcx>), ErrorGuaranteed>

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fn is_let_irrefutable( &mut self, pat: &'p Pat<'tcx>, scrut: Option<&Expr<'tcx>> ) -> Result<RefutableFlag, ErrorGuaranteed>

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fn check_binding_is_irrefutable( &mut self, pat: &'p Pat<'tcx>, origin: &str, scrut: Option<&Expr<'tcx>>, sp: Option<Span> )

Trait Implementations§

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impl<'p, 'tcx> Visitor<'p, 'tcx> for MatchVisitor<'p, 'tcx>

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fn thir(&self) -> &'p Thir<'tcx>

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fn visit_arm(&mut self, arm: &'p Arm<'tcx>)

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fn visit_expr(&mut self, ex: &'p Expr<'tcx>)

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fn visit_stmt(&mut self, stmt: &'p Stmt<'tcx>)

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fn visit_block(&mut self, block: &'thir Block)

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fn visit_pat(&mut self, pat: &'thir Pat<'tcx>)

Auto Trait Implementations§

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impl<'p, 'tcx> !DynSend for MatchVisitor<'p, 'tcx>

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impl<'p, 'tcx> !DynSync for MatchVisitor<'p, 'tcx>

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impl<'p, 'tcx> Freeze for MatchVisitor<'p, 'tcx>

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impl<'p, 'tcx> !RefUnwindSafe for MatchVisitor<'p, 'tcx>

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impl<'p, 'tcx> !Send for MatchVisitor<'p, 'tcx>

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impl<'p, 'tcx> !Sync for MatchVisitor<'p, 'tcx>

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impl<'p, 'tcx> Unpin for MatchVisitor<'p, 'tcx>

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impl<'p, 'tcx> !UnwindSafe for MatchVisitor<'p, '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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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<'a, T> Captures<'a> for T
where T: ?Sized,

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

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: 64 bytes