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pub mod canonical;
pub mod unify_key;
use crate::ty::Region;
use crate::ty::{OpaqueTypeKey, Ty};
use rustc_data_structures::sync::Lrc;
use rustc_span::Span;
/// Requires that `region` must be equal to one of the regions in `choice_regions`.
/// We often denote this using the syntax:
///
/// ```text
/// R0 member of [O1..On]
/// ```
#[derive(Debug, Clone, HashStable, TypeFoldable, TypeVisitable, Lift)]
pub struct MemberConstraint<'tcx> {
/// The `DefId` and substs of the opaque type causing this constraint.
/// Used for error reporting.
pub key: OpaqueTypeKey<'tcx>,
/// The span where the hidden type was instantiated.
pub definition_span: Span,
/// The hidden type in which `member_region` appears: used for error reporting.
pub hidden_ty: Ty<'tcx>,
/// The region `R0`.
pub member_region: Region<'tcx>,
/// The options `O1..On`.
pub choice_regions: Lrc<Vec<Region<'tcx>>>,
}
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