diff --git a/clang/lib/AST/DeclTemplate.cpp b/clang/lib/AST/DeclTemplate.cpp
index e750bb8b6af7..9bd3b64feb4e 100755
--- a/clang/lib/AST/DeclTemplate.cpp
+++ b/clang/lib/AST/DeclTemplate.cpp
@@ -488,7 +488,10 @@ static void ProfileTemplateParameterList(ASTContext &C,
     if (const auto *TTP = dyn_cast<TemplateTypeParmDecl>(D)) {
       ID.AddInteger(1);
       ID.AddBoolean(TTP->isParameterPack());
-      // TODO: Concepts: profile type-constraints.
+      ID.AddBoolean(TTP->hasTypeConstraint());
+      if (const TypeConstraint *TC = TTP->getTypeConstraint())
+        TC->getImmediatelyDeclaredConstraint()->Profile(ID, C,
+                                                        /*Canonical=*/true);
       continue;
     }
     const auto *TTP = cast<TemplateTemplateParmDecl>(D);
diff --git a/clang/test/CXX/temp/temp.constr/temp.constr.constr/partial-specializations.cpp b/clang/test/CXX/temp/temp.constr/temp.constr.constr/partial-specializations.cpp
index 1ea4da29ee9f..9f3c21f99174 100644
--- a/clang/test/CXX/temp/temp.constr/temp.constr.constr/partial-specializations.cpp
+++ b/clang/test/CXX/temp/temp.constr/temp.constr.constr/partial-specializations.cpp
@@ -31,6 +31,23 @@ namespace class_templates
   // expected-note@-2{{during template argument deduction for class template partial specialization 'B<T *>' [with T = int *]}}
   // expected-note@-3{{during template argument deduction for class template partial specialization 'B<T **>' [with T = int]}}
   // expected-note@-4 2{{in instantiation of template class 'class_templates::B<int **>' requested here}}
+
+  template<typename T, typename U = double>
+  concept same_as = is_same<T, U>::value;
+
+  template<same_as<bool> T> requires A<T>::type
+  struct B<T*> {};
+  // expected-note@-1{{previous}}
+
+  template<same_as<bool> T> requires A<T>::type
+  struct B<T*> {};
+  // expected-error@-1{{redefinition}}
+
+  template<same_as T> requires A<T>::type
+  struct B<T*> {};
+
+  template<same_as<int> T> requires A<T>::type
+  struct B<T*> {};
 }
 
 namespace variable_templates