Enum rustc_trait_selection::infer::RegionResolutionError

pub enum RegionResolutionError<'tcx> {
    ConcreteFailure(SubregionOrigin<'tcx>, &'tcx RegionKind, &'tcx RegionKind),
    GenericBoundFailure(SubregionOrigin<'tcx>, GenericKind<'tcx>, &'tcx RegionKind),
    SubSupConflict(RegionVid, RegionVariableOrigin, SubregionOrigin<'tcx>, &'tcx RegionKind, SubregionOrigin<'tcx>, &'tcx RegionKind),
    UpperBoundUniverseConflict(RegionVid, RegionVariableOrigin, UniverseIndex, SubregionOrigin<'tcx>, &'tcx RegionKind),
    MemberConstraintFailure {
        span: Span,
        hidden_ty: &'tcx TyS<'tcx>,
        member_region: &'tcx RegionKind,
    },
}

Variants

ConcreteFailure(SubregionOrigin<'tcx>, &'tcx RegionKind, &'tcx RegionKind)

ConcreteFailure(o, a, b):

o requires that a <= b, but this does not hold

GenericBoundFailure(SubregionOrigin<'tcx>, GenericKind<'tcx>, &'tcx RegionKind)

`GenericBoundFailure(p, s, a)

The parameter/associated-type p must be known to outlive the lifetime a (but none of the known bounds are sufficient).

SubSupConflict(RegionVid, RegionVariableOrigin, SubregionOrigin<'tcx>, &'tcx RegionKind, SubregionOrigin<'tcx>, &'tcx RegionKind)

SubSupConflict(v, v_origin, sub_origin, sub_r, sup_origin, sup_r):

Could not infer a value for v (which has origin v_origin) because sub_r <= v (due to sub_origin) but v <= sup_r (due to sup_origin) and sub_r <= sup_r does not hold.

UpperBoundUniverseConflict(RegionVid, RegionVariableOrigin, UniverseIndex, SubregionOrigin<'tcx>, &'tcx RegionKind)

Indicates a 'b: 'a constraint where 'a is in a universe that cannot name the placeholder 'b.

MemberConstraintFailure

Indicates a failure of a MemberConstraint. These arise during impl trait processing explicitly – basically, the impl trait’s hidden type included some region that it was not supposed to.

Fields of MemberConstraintFailure

span: Spanhidden_ty: &'tcx TyS<'tcx>member_region: &'tcx RegionKind

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.

Size: 144 bytes