Enum rustc_trait_selection::traits::specialize::specialization_graph::OverlapMode

pub enum OverlapMode {
    Stable,
    WithNegative,
    Strict,
}

What kind of overlap check are we doing – this exists just for testing and feature-gating purposes.

Variants

Stable

The 1.0 rules (either types fail to unify, or where clauses are not implemented for crate-local types)

WithNegative

Feature-gated test: Stable, or there is an explicit negative impl that rules out one of the where-clauses.

Strict

Just check for negative impls, not for “where clause not implemented”: used for testing.

Implementations

impl OverlapMode

pub fn get(tcx: TyCtxt<'_>, trait_id: DefId) -> OverlapMode

pub fn use_negative_impl(&self) -> bool

pub fn use_implicit_negative(&self) -> bool

Trait Implementations

impl Clone for OverlapMode

fn clone(&self) -> OverlapMode

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for OverlapMode

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

Formats the value using the given formatter.

impl<__D> Decodable<__D> for OverlapMode

where __D: TyDecoder,

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

impl<__E> Encodable<__E> for OverlapMode

where __E: TyEncoder,

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

impl Hash for OverlapMode

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

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

fn hash_stable( &self, __hcx: &mut StableHashingContext<'__ctx>, __hasher: &mut StableHasher<SipHasher128>, )

impl PartialEq for OverlapMode

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl Copy for OverlapMode

impl Eq for OverlapMode

impl StructuralPartialEq for OverlapMode

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: 1 byte

Size for each variant:

• Stable: 0 bytes
• WithNegative: 0 bytes
• Strict: 0 bytes