Struct rustc_const_eval::transform::check_consts::qualifs::NeedsDrop

pub struct NeedsDrop;

Constant containing an ADT that implements Drop. This must be ruled out because implicit promotion would remove side-effects that occur as part of dropping that value. N.B., the implicit promotion has to reject const Drop implementations because even if side-effects are ruled out through other means, the execution of the drop could diverge.

Trait Implementations

impl Qualif for NeedsDrop

const ANALYSIS_NAME: &'static str = "flow_needs_drop"

The name of the file used to debug the dataflow analysis that computes this qualif.

const IS_CLEARED_ON_MOVE: bool = true

Whether this Qualif is cleared when a local is moved from.

fn in_qualifs(qualifs: &ConstQualifs) -> bool

Extracts the field of ConstQualifs that corresponds to this Qualif.

fn in_any_value_of_ty<'tcx>(cx: &ConstCx<'_, 'tcx>, ty: Ty<'tcx>) -> bool

Returns true if any value of the given type could possibly have this Qualif.

fn in_adt_inherently<'tcx>( cx: &ConstCx<'_, 'tcx>, adt: AdtDef<'tcx>, _: GenericArgsRef<'tcx> ) -> bool

Returns true if this Qualif is inherent to the given struct or enum.

fn deref_structural<'tcx>(_cx: &ConstCx<'_, 'tcx>) -> bool

Returns true if this Qualif behaves sructurally for pointers and references: the pointer/reference qualifies if and only if the pointee qualifies.

const ALLOW_PROMOTED: bool = false

Whether this Qualif might be evaluated after the promotion and can encounter a promoted.

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.

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