Enum rustc_infer::infer::SubregionOrigin

pub enum SubregionOrigin<'tcx> {
    Subtype(Box<TypeTrace<'tcx>>),
    RelateObjectBound(Span),
    RelateParamBound(Span, Ty<'tcx>, Option<Span>),
    RelateRegionParamBound(Span),
    Reborrow(Span),
    ReborrowUpvar(Span, UpvarId),
    DataBorrowed(Ty<'tcx>, Span),
    ReferenceOutlivesReferent(Ty<'tcx>, Span),
    CompareImplMethodObligation {
        span: Span,
        impl_item_def_id: DefId,
        trait_item_def_id: DefId,
    },
    CompareImplTypeObligation {
        span: Span,
        impl_item_def_id: DefId,
        trait_item_def_id: DefId,
    },
}

The origin of a r1 <= r2 constraint.

See error_reporting module for more details

Variants

Subtype(Box<TypeTrace<'tcx>>)

Arose from a subtyping relation

RelateObjectBound(Span)

When casting &'a T to an &'b Trait object, relating 'a to 'b

RelateParamBound(Span, Ty<'tcx>, Option<Span>)

Some type parameter was instantiated with the given type, and that type must outlive some region.

RelateRegionParamBound(Span)

The given region parameter was instantiated with a region that must outlive some other region.

Reborrow(Span)

Creating a pointer b to contents of another reference

ReborrowUpvar(Span, UpvarId)

Creating a pointer b to contents of an upvar

DataBorrowed(Ty<'tcx>, Span)

Data with type Ty<'tcx> was borrowed

ReferenceOutlivesReferent(Ty<'tcx>, Span)

(&’a &’b T) where a >= b

CompareImplMethodObligation

Fields

span: Span

impl_item_def_id: DefId

trait_item_def_id: DefId

Comparing the signature and requirements of an impl method against the containing trait.

CompareImplTypeObligation

Fields

span: Span

impl_item_def_id: DefId

trait_item_def_id: DefId

Comparing the signature and requirements of an impl associated type against the containing trait

Implementations

impl<'tcx> SubregionOrigin<'tcx>

pub fn span(&self) -> Span

pub fn from_obligation_cause<F>(
    cause: &ObligationCause<'tcx>,
    default: F
) -> Self where
    F: FnOnce() -> Self, 

Trait Implementations

impl<'tcx> Clone for SubregionOrigin<'tcx>

fn clone(&self) -> SubregionOrigin<'tcx>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'tcx> Debug for SubregionOrigin<'tcx>

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

Formats the value using the given formatter.

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: 32 bytes

Size for each variant:

• Subtype: 12 bytes
• RelateObjectBound: 8 bytes
• RelateParamBound: 28 bytes
• RelateRegionParamBound: 8 bytes
• Reborrow: 8 bytes
• ReborrowUpvar: 20 bytes
• DataBorrowed: 20 bytes
• ReferenceOutlivesReferent: 20 bytes
• CompareImplMethodObligation: 24 bytes
• CompareImplTypeObligation: 24 bytes