Struct rustc_mir::transform::check_consts::qualifs::NeedsDrop

pub struct NeedsDrop;

Constant containing an ADT that implements Drop. This must be ruled out (a) because we cannot run Drop during compile-time as that might not be a const fn, and (b) because implicit promotion would remove side-effects that occur as part of dropping that value.

Trait Implementations

impl Qualif for NeedsDrop

const ANALYSIS_NAME: &'static str

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

const IS_CLEARED_ON_MOVE: bool

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: &'tcx AdtDef,
    _: SubstsRef<'tcx>
) -> bool

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

Layout

Note: Most layout information is completely unstable and may be different between compiler versions and platforms. 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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