Struct HasMutInterior

pub struct HasMutInterior;

Constant containing interior mutability (UnsafeCell<T>). This must be ruled out to make sure that evaluating the constant at compile-time and at any point during the run-time would produce the same result. In particular, promotion of temporaries must not change program behavior; if the promoted could be written to, that would be a problem.

Trait Implementations

impl Qualif for HasMutInterior

const ANALYSIS_NAME: &'static str = "flow_has_mut_interior"

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

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 IS_CLEARED_ON_MOVE: bool = false

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

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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