Struct rustc_mir_build::thir::pattern::check_match::MatchVisitor

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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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where T: 'static + ?Sized,

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Gets the TypeId of self. Read more
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where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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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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fn instrument(self, span: Span) -> Instrumented<Self>

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

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type Error = !

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const ALIGN: usize = _

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type Init = T

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unsafe fn init(init: <T as Pointable>::Init) -> usize

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type Error = <U as TryFrom<T>>::Error

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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