diff --git a/src/librustc_typeck/collect.rs b/src/librustc_typeck/collect.rs
index f832bf8d86e..e13434db5d8 100644
--- a/src/librustc_typeck/collect.rs
+++ b/src/librustc_typeck/collect.rs
@@ -716,6 +716,16 @@ fn ensure_no_ty_param_bounds(ccx: &CrateCtxt,
         }
     }
 
+    for predicate in generics.where_clause.predicates.iter() {
+        match *predicate {
+            hir::WherePredicate::BoundPredicate(..) => {
+                warn = true;
+            }
+            hir::WherePredicate::RegionPredicate(..) => { }
+            hir::WherePredicate::EqPredicate(..) => { }
+        }
+    }
+
     if warn {
         // According to accepted RFC #XXX, we should
         // eventually accept these, but it will not be
diff --git a/src/test/compile-fail/issue-17994.rs b/src/test/compile-fail/issue-17994.rs
index fcbc08327b9..ac15bd9d15b 100644
--- a/src/test/compile-fail/issue-17994.rs
+++ b/src/test/compile-fail/issue-17994.rs
@@ -9,5 +9,6 @@
 // except according to those terms.
 
 trait Tr {}
-type Huh<T> where T: Tr = isize; //~ ERROR type parameter `T` is unused
+type Huh<T> where T: Tr = isize; //~  ERROR type parameter `T` is unused
+                                 //~| WARNING E0122
 fn main() {}
diff --git a/src/test/compile-fail/issue-39122.rs b/src/test/compile-fail/issue-39122.rs
new file mode 100644
index 00000000000..2e8a740f893
--- /dev/null
+++ b/src/test/compile-fail/issue-39122.rs
@@ -0,0 +1,13 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+type Foo<T: std::ops::Add> = T; //~ WARNING E0122
+
+type Bar<T> where T: std::ops::Add = T; //~ WARNING E0122
diff --git a/src/test/compile-fail/private-in-public-warn.rs b/src/test/compile-fail/private-in-public-warn.rs
index 3496348985d..92d96595fd7 100644
--- a/src/test/compile-fail/private-in-public-warn.rs
+++ b/src/test/compile-fail/private-in-public-warn.rs
@@ -89,6 +89,7 @@ mod traits_where {
     pub type Alias<T> where T: PrivTr = T;
         //~^ ERROR private trait `traits_where::PrivTr` in public interface
         //~| WARNING hard error
+        //~| WARNING E0122
     pub trait Tr2<T> where T: PrivTr {}
         //~^ ERROR private trait `traits_where::PrivTr` in public interface
         //~| WARNING hard error