2 files changed, 1 insertions, 35 deletions
diff --git a/compiler/rustc_middle/src/infer/canonical.rs b/compiler/rustc_middle/src/infer/canonical.rs
index ac55497f8b3..0f408375e05 100644
--- a/compiler/rustc_middle/src/infer/canonical.rs
+++ b/compiler/rustc_middle/src/infer/canonical.rs
@@ -30,7 +30,6 @@ pub use rustc_type_ir as ir;
 pub use rustc_type_ir::{CanonicalTyVarKind, CanonicalVarKind};
 use smallvec::SmallVec;
 
-use crate::infer::MemberConstraint;
 use crate::mir::ConstraintCategory;
 use crate::ty::{self, GenericArg, List, Ty, TyCtxt, TypeFlags, TypeVisitableExt};
 
@@ -91,14 +90,13 @@ pub struct QueryResponse<'tcx, R> {
 #[derive(HashStable, TypeFoldable, TypeVisitable)]
 pub struct QueryRegionConstraints<'tcx> {
     pub outlives: Vec<QueryOutlivesConstraint<'tcx>>,
-    pub member_constraints: Vec<MemberConstraint<'tcx>>,
 }
 
 impl QueryRegionConstraints<'_> {
     /// Represents an empty (trivially true) set of region
     /// constraints.
     pub fn is_empty(&self) -> bool {
-        self.outlives.is_empty() && self.member_constraints.is_empty()
+        self.outlives.is_empty()
     }
 }
 
diff --git a/compiler/rustc_middle/src/infer/mod.rs b/compiler/rustc_middle/src/infer/mod.rs
index 19fe9e5a54f..3dfcf90cb93 100644
--- a/compiler/rustc_middle/src/infer/mod.rs
+++ b/compiler/rustc_middle/src/infer/mod.rs
@@ -1,34 +1,2 @@
 pub mod canonical;
 pub mod unify_key;
-
-use rustc_data_structures::sync::Lrc;
-use rustc_macros::{HashStable, TypeFoldable, TypeVisitable};
-use rustc_span::Span;
-
-use crate::ty::{OpaqueTypeKey, Region, Ty};
-
-/// 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, PartialEq, Eq, Hash)]
-#[derive(HashStable, TypeFoldable, TypeVisitable)]
-pub struct MemberConstraint<'tcx> {
-    /// The `DefId` and args 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>>>,
-}