diff --git a/src/librustc_typeck/check/implicator.rs b/src/librustc_typeck/check/implicator.rs
index da25719baaa4ab3f06e67dec3adfcb5420b94465..4aaaf4ffe5ab3028aa982a204df157ec4d289670 100644
--- a/src/librustc_typeck/check/implicator.rs
+++ b/src/librustc_typeck/check/implicator.rs
@@ -329,6 +329,9 @@ fn accumulate_from_adt(&mut self,
     fn accumulate_from_assoc_types_transitive(&mut self,
                                               data: &ty::PolyTraitPredicate<'tcx>)
     {
+        debug!("accumulate_from_assoc_types_transitive({})",
+               data.repr(self.tcx()));
+
         for poly_trait_ref in traits::supertraits(self.tcx(), data.to_poly_trait_ref()) {
             match ty::no_late_bound_regions(self.tcx(), &poly_trait_ref) {
                 Some(trait_ref) => { self.accumulate_from_assoc_types(trait_ref); }
@@ -340,6 +343,9 @@ fn accumulate_from_assoc_types_transitive(&mut self,
     fn accumulate_from_assoc_types(&mut self,
                                    trait_ref: Rc<ty::TraitRef<'tcx>>)
     {
+        debug!("accumulate_from_assoc_types({})",
+               trait_ref.repr(self.tcx()));
+
         let trait_def_id = trait_ref.def_id;
         let trait_def = ty::lookup_trait_def(self.tcx(), trait_def_id);
         let assoc_type_projections: Vec<_> =
@@ -347,6 +353,8 @@ fn accumulate_from_assoc_types(&mut self,
                      .iter()
                      .map(|&name| ty::mk_projection(self.tcx(), trait_ref.clone(), name))
                      .collect();
+        debug!("accumulate_from_assoc_types: assoc_type_projections={}",
+               assoc_type_projections.repr(self.tcx()));
         let tys = match self.fully_normalize(&assoc_type_projections) {
             Ok(tys) => { tys }
             Err(ErrorReported) => { return; }
diff --git a/src/test/compile-fail/regions-assoc-type-in-supertrait-outlives-container.rs b/src/test/compile-fail/regions-assoc-type-in-supertrait-outlives-container.rs
index e96c345034bce6c070873ff7b4b303da5bcfe6e7..6aa0cc003ce64253ee1505700c5fd05bb7381999 100644
--- a/src/test/compile-fail/regions-assoc-type-in-supertrait-outlives-container.rs
+++ b/src/test/compile-fail/regions-assoc-type-in-supertrait-outlives-container.rs
@@ -15,12 +15,12 @@
 
 #![allow(dead_code)]
 
+use std::marker::PhantomFn;
+
 ///////////////////////////////////////////////////////////////////////////
 
-pub trait TheTrait {
+pub trait TheTrait: PhantomFn<Self, Self> {
     type TheAssocType;
-
-    fn dummy(&self) { }
 }
 
 pub trait TheSubTrait : TheTrait {
diff --git a/src/test/compile-fail/regions-assoc-type-outlives-container-hrtb.rs b/src/test/compile-fail/regions-assoc-type-outlives-container-hrtb.rs
index 7d955065ff45519a3af62c32a58fe8c0d95bd44e..dd89e0e038b24235fa1a0c424d53196055933547 100644
--- a/src/test/compile-fail/regions-assoc-type-outlives-container-hrtb.rs
+++ b/src/test/compile-fail/regions-assoc-type-outlives-container-hrtb.rs
@@ -14,12 +14,12 @@
 #![allow(dead_code)]
 #![feature(rustc_attrs)]
 
+use std::marker::PhantomFn;
+
 ///////////////////////////////////////////////////////////////////////////
 
-pub trait TheTrait<'b> {
+pub trait TheTrait<'b> : PhantomFn<Self,Self> {
     type TheAssocType;
-
-    fn dummy(&'b self) { }
 }
 
 pub struct TheType<'b> {
diff --git a/src/test/compile-fail/regions-assoc-type-outlives-container-wc.rs b/src/test/compile-fail/regions-assoc-type-outlives-container-wc.rs
index 6d8a02ab17480beb4dd567a9dcdb8cb1a3f12653..da7546ce21c60ef6563fd3b02bf2cc92b2b610bf 100644
--- a/src/test/compile-fail/regions-assoc-type-outlives-container-wc.rs
+++ b/src/test/compile-fail/regions-assoc-type-outlives-container-wc.rs
@@ -15,12 +15,12 @@
 
 #![allow(dead_code)]
 
+use std::marker::PhantomFn;
+
 ///////////////////////////////////////////////////////////////////////////
 
-pub trait TheTrait {
+pub trait TheTrait: PhantomFn<Self, Self> {
     type TheAssocType;
-
-    fn dummy(&self) { }
 }
 
 pub struct TheType<'b> {
diff --git a/src/test/compile-fail/regions-assoc-type-outlives-container.rs b/src/test/compile-fail/regions-assoc-type-outlives-container.rs
index 5fafec50a4b5863077501cefabe63cd097617a82..e1e72e6f56e93108393b221311815a27975593c0 100644
--- a/src/test/compile-fail/regions-assoc-type-outlives-container.rs
+++ b/src/test/compile-fail/regions-assoc-type-outlives-container.rs
@@ -13,13 +13,14 @@
 // outlive the location in which the type appears. Issue #22246.
 
 #![allow(dead_code)]
+#![feature(rustc_attrs)]
+
+use std::marker::PhantomFn;
 
 ///////////////////////////////////////////////////////////////////////////
 
-pub trait TheTrait {
+pub trait TheTrait: PhantomFn<Self, Self> {
     type TheAssocType;
-
-    fn dummy(&self) { }
 }
 
 pub struct TheType<'b> {