Struct rustc_middle::ty::closure::CaptureInfo

pub struct CaptureInfo {
    pub capture_kind_expr_id: Option<HirId>,
    pub path_expr_id: Option<HirId>,
    pub capture_kind: UpvarCapture,
}

Part of MinCaptureInformationMap; describes the capture kind (&, &mut, move) for a particular capture as well as identifying the part of the source code that triggered this capture to occur.

Fields

capture_kind_expr_id: Option<HirId>

Expr Id pointing to use that resulted in selecting the current capture kind

Eg:

let mut t = (0,1);

let c = || {
    println!("{t:?}"); // L1
    t.1 = 4; // L2
};

capture_kind_expr_id will point to the use on L2 and path_expr_id will point to the use on L1.

If the user doesn’t enable feature capture_disjoint_fields (RFC 2229) then, it is possible that we don’t see the use of a particular place resulting in capture_kind_expr_id being None. In such case we fallback on uvpars_mentioned for span.

Eg:

let x = 5;

let c = || {
    let _ = x;
};

In this example, if capture_disjoint_fields is not set, then x will be captured, but we won’t see it being used during capture analysis, since it’s essentially a discard.

path_expr_id: Option<HirId>

Expr Id pointing to use that resulted the corresponding place being captured

See capture_kind_expr_id for example.

capture_kind: UpvarCapture

Capture mode that was selected

Trait Implementations

impl Clone for CaptureInfo

fn clone(&self) -> CaptureInfo

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CaptureInfo

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

Formats the value using the given formatter.

impl<__D: TyDecoder> Decodable<__D> for CaptureInfo

fn decode(__decoder: &mut __D) -> Self

impl<__E: TyEncoder> Encodable<__E> for CaptureInfo

fn encode(&self, __encoder: &mut __E)

impl<'__ctx> HashStable<StableHashingContext<'__ctx>> for CaptureInfo

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

impl PartialEq for CaptureInfo

fn eq(&self, other: &CaptureInfo) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for CaptureInfo

fn try_fold_with<__F: FallibleTypeFolder<TyCtxt<'tcx>>>( self, __folder: &mut __F ) -> Result<Self, __F::Error>

The entry point for folding. To fold a value t with a folder f call: t.try_fold_with(f).

fn fold_with<F>(self, folder: &mut F) -> Self

where F: TypeFolder<I>,

A convenient alternative to try_fold_with for use with infallible folders. Do not override this method, to ensure coherence with try_fold_with.

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

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

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

impl Copy for CaptureInfo

impl StructuralPartialEq for CaptureInfo

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: 20 bytes