diff --git a/src/librustc/infer/error_reporting/different_lifetimes.rs b/src/librustc/infer/error_reporting/different_lifetimes.rs
index 36370e23f216..c64bd610962e 100644
--- a/src/librustc/infer/error_reporting/different_lifetimes.rs
+++ b/src/librustc/infer/error_reporting/different_lifetimes.rs
@@ -13,8 +13,8 @@
 use hir;
 use infer::InferCtxt;
 use ty::{self, Region};
-use infer::region_inference::RegionResolutionError::*;
-use infer::region_inference::RegionResolutionError;
+use infer::lexical_region_resolve::RegionResolutionError::*;
+use infer::lexical_region_resolve::RegionResolutionError;
 use hir::map as hir_map;
 use middle::resolve_lifetime as rl;
 use hir::intravisit::{self, Visitor, NestedVisitorMap};
diff --git a/src/librustc/infer/error_reporting/mod.rs b/src/librustc/infer/error_reporting/mod.rs
index 072f76eb6aa8..9ce0e503280e 100644
--- a/src/librustc/infer/error_reporting/mod.rs
+++ b/src/librustc/infer/error_reporting/mod.rs
@@ -57,7 +57,8 @@
 
 use infer;
 use super::{InferCtxt, TypeTrace, SubregionOrigin, RegionVariableOrigin, ValuePairs};
-use super::region_inference::{RegionResolutionError, GenericKind};
+use super::region_inference::GenericKind;
+use super::lexical_region_resolve::RegionResolutionError;
 
 use std::fmt;
 use hir;
diff --git a/src/librustc/infer/error_reporting/named_anon_conflict.rs b/src/librustc/infer/error_reporting/named_anon_conflict.rs
index e0b8a193ede0..6af7415ba537 100644
--- a/src/librustc/infer/error_reporting/named_anon_conflict.rs
+++ b/src/librustc/infer/error_reporting/named_anon_conflict.rs
@@ -11,8 +11,8 @@
 //! Error Reporting for Anonymous Region Lifetime Errors
 //! where one region is named and the other is anonymous.
 use infer::InferCtxt;
-use infer::region_inference::RegionResolutionError::*;
-use infer::region_inference::RegionResolutionError;
+use infer::lexical_region_resolve::RegionResolutionError::*;
+use infer::lexical_region_resolve::RegionResolutionError;
 use ty;
 
 impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
diff --git a/src/librustc/infer/lexical_region_resolve/mod.rs b/src/librustc/infer/lexical_region_resolve/mod.rs
index 682f5743e4bf..217387befd89 100644
--- a/src/librustc/infer/lexical_region_resolve/mod.rs
+++ b/src/librustc/infer/lexical_region_resolve/mod.rs
@@ -11,9 +11,10 @@
 //! The code to do lexical region resolution.
 
 use infer::SubregionOrigin;
+use infer::RegionVariableOrigin;
 use infer::region_inference::Constraint;
+use infer::region_inference::GenericKind;
 use infer::region_inference::RegionVarBindings;
-use infer::region_inference::RegionResolutionError;
 use infer::region_inference::VarValue;
 use infer::region_inference::VerifyBound;
 use middle::free_region::RegionRelations;
@@ -23,11 +24,38 @@ use std::fmt;
 use std::u32;
 use ty::{self, TyCtxt};
 use ty::{Region, RegionVid};
-use ty::{ReEmpty, ReStatic, ReFree, ReEarlyBound, ReErased};
-use ty::{ReLateBound, ReScope, ReVar, ReSkolemized};
+use ty::{ReEarlyBound, ReEmpty, ReErased, ReFree, ReStatic};
+use ty::{ReLateBound, ReScope, ReSkolemized, ReVar};
 
 mod graphviz;
 
+#[derive(Clone, Debug)]
+pub enum RegionResolutionError<'tcx> {
+    /// `ConcreteFailure(o, a, b)`:
+    ///
+    /// `o` requires that `a <= b`, but this does not hold
+    ConcreteFailure(SubregionOrigin<'tcx>, Region<'tcx>, Region<'tcx>),
+
+    /// `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).
+    GenericBoundFailure(SubregionOrigin<'tcx>, GenericKind<'tcx>, Region<'tcx>),
+
+    /// `SubSupConflict(v, sub_origin, sub_r, sup_origin, sup_r)`:
+    ///
+    /// Could not infer a value for `v` because `sub_r <= v` (due to
+    /// `sub_origin`) but `v <= sup_r` (due to `sup_origin`) and
+    /// `sub_r <= sup_r` does not hold.
+    SubSupConflict(
+        RegionVariableOrigin,
+        SubregionOrigin<'tcx>,
+        Region<'tcx>,
+        SubregionOrigin<'tcx>,
+        Region<'tcx>,
+    ),
+}
+
 struct RegionAndOrigin<'tcx> {
     region: Region<'tcx>,
     origin: SubregionOrigin<'tcx>,
@@ -327,7 +355,11 @@ impl<'a, 'gcx, 'tcx> RegionVarBindings<'a, 'gcx, 'tcx> {
                         sup
                     );
 
-                    errors.push(RegionResolutionError::ConcreteFailure((*origin).clone(), sub, sup));
+                    errors.push(RegionResolutionError::ConcreteFailure(
+                        (*origin).clone(),
+                        sub,
+                        sup,
+                    ));
                 }
 
                 Constraint::VarSubReg(a_vid, b_region) => {
diff --git a/src/librustc/infer/region_inference/mod.rs b/src/librustc/infer/region_inference/mod.rs
index 91989d7b106d..d5997aa0662f 100644
--- a/src/librustc/infer/region_inference/mod.rs
+++ b/src/librustc/infer/region_inference/mod.rs
@@ -142,31 +142,6 @@ enum CombineMapType {
     Glb,
 }
 
-#[derive(Clone, Debug)]
-pub enum RegionResolutionError<'tcx> {
-    /// `ConcreteFailure(o, a, b)`:
-    ///
-    /// `o` requires that `a <= b`, but this does not hold
-    ConcreteFailure(SubregionOrigin<'tcx>, Region<'tcx>, Region<'tcx>),
-
-    /// `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).
-    GenericBoundFailure(SubregionOrigin<'tcx>, GenericKind<'tcx>, Region<'tcx>),
-
-    /// `SubSupConflict(v, sub_origin, sub_r, sup_origin, sup_r)`:
-    ///
-    /// Could not infer a value for `v` because `sub_r <= v` (due to
-    /// `sub_origin`) but `v <= sup_r` (due to `sup_origin`) and
-    /// `sub_r <= sup_r` does not hold.
-    SubSupConflict(RegionVariableOrigin,
-                   SubregionOrigin<'tcx>,
-                   Region<'tcx>,
-                   SubregionOrigin<'tcx>,
-                   Region<'tcx>),
-}
-
 #[derive(Copy, Clone, Debug)]
 pub enum VarValue<'tcx> {
     Value(Region<'tcx>),