diff --git a/clang/lib/Sema/SemaTemplateDeduction.cpp b/clang/lib/Sema/SemaTemplateDeduction.cpp
--- a/clang/lib/Sema/SemaTemplateDeduction.cpp
+++ b/clang/lib/Sema/SemaTemplateDeduction.cpp
@@ -5222,6 +5222,39 @@
       return FT1;
   }
 
+  // This a speculative fix for CWG1432 (Similar to the fix for CWG1395) that
+  // there is no wording or even resolution for this issue.
+  bool ClangABICompat15 =
+      Context.getLangOpts().getClangABICompat() <= LangOptions::ClangABI::Ver15;
+  if (!ClangABICompat15) {
+    for (int i = 0, e = std::min(NumParams1, NumParams2); i < e; ++i) {
+      QualType T1 = FD1->getParamDecl(i)->getType().getCanonicalType();
+      QualType T2 = FD2->getParamDecl(i)->getType().getCanonicalType();
+      auto *TST1 = dyn_cast<TemplateSpecializationType>(T1);
+      auto *TST2 = dyn_cast<TemplateSpecializationType>(T2);
+      if (!TST1 || !TST2)
+        continue;
+      const TemplateArgument &TA1 = TST1->template_arguments().back();
+      if (TA1.getKind() == TemplateArgument::Pack) {
+        assert(TST1->getNumArgs() == TST2->getNumArgs());
+        const TemplateArgument &TA2 = TST2->template_arguments().back();
+        assert(TA2.getKind() == TemplateArgument::Pack);
+        unsigned PackSize1 = TA1.pack_size();
+        unsigned PackSize2 = TA2.pack_size();
+        bool IsPackExpansion1 =
+            PackSize1 && TA1.pack_elements().back().isPackExpansion();
+        bool IsPackExpansion2 =
+            PackSize2 && TA2.pack_elements().back().isPackExpansion();
+        if (PackSize1 != PackSize2 && IsPackExpansion1 != IsPackExpansion2) {
+          if (PackSize1 > PackSize2 && IsPackExpansion1)
+            return FT2;
+          if (PackSize1 < PackSize2 && IsPackExpansion2)
+            return FT1;
+        }
+      }
+    }
+  }
+
   return JudgeByConstraints();
 }
 
@@ -5457,30 +5490,29 @@
     return nullptr;
 
   if (Better1 && Better2) {
+    // This a speculative fix for CWG1432 (Similar to the fix for CWG1395) that
+    // there is no wording or even resolution for this issue.
     bool ClangABICompat15 = S.Context.getLangOpts().getClangABICompat() <=
                             LangOptions::ClangABI::Ver15;
     if (!ClangABICompat15) {
-      // Consider this a fix for CWG1432. Similar to the fix for CWG1395.
-      auto *TST1 = T1->castAs<TemplateSpecializationType>();
-      auto *TST2 = T2->castAs<TemplateSpecializationType>();
-      if (TST1->getNumArgs()) {
-        const TemplateArgument &TA1 = TST1->template_arguments().back();
-        if (TA1.getKind() == TemplateArgument::Pack) {
-          assert(TST1->getNumArgs() == TST2->getNumArgs());
-          const TemplateArgument &TA2 = TST2->template_arguments().back();
-          assert(TA2.getKind() == TemplateArgument::Pack);
-          unsigned PackSize1 = TA1.pack_size();
-          unsigned PackSize2 = TA2.pack_size();
-          bool IsPackExpansion1 =
-              PackSize1 && TA1.pack_elements().back().isPackExpansion();
-          bool IsPackExpansion2 =
-              PackSize2 && TA2.pack_elements().back().isPackExpansion();
-          if (PackSize1 != PackSize2 && IsPackExpansion1 != IsPackExpansion2) {
-            if (PackSize1 > PackSize2 && IsPackExpansion1)
-              return GetP2()(P1, P2);
-            if (PackSize1 < PackSize2 && IsPackExpansion2)
-              return P1;
-          }
+      auto *TST1 = cast<TemplateSpecializationType>(T1);
+      auto *TST2 = cast<TemplateSpecializationType>(T2);
+      const TemplateArgument &TA1 = TST1->template_arguments().back();
+      if (TA1.getKind() == TemplateArgument::Pack) {
+        assert(TST1->getNumArgs() == TST2->getNumArgs());
+        const TemplateArgument &TA2 = TST2->template_arguments().back();
+        assert(TA2.getKind() == TemplateArgument::Pack);
+        unsigned PackSize1 = TA1.pack_size();
+        unsigned PackSize2 = TA2.pack_size();
+        bool IsPackExpansion1 =
+            PackSize1 && TA1.pack_elements().back().isPackExpansion();
+        bool IsPackExpansion2 =
+            PackSize2 && TA2.pack_elements().back().isPackExpansion();
+        if (PackSize1 != PackSize2 && IsPackExpansion1 != IsPackExpansion2) {
+          if (PackSize1 > PackSize2 && IsPackExpansion1)
+            return GetP2()(P1, P2);
+          if (PackSize1 < PackSize2 && IsPackExpansion2)
+            return P1;
         }
       }
     }
diff --git a/clang/test/CXX/drs/dr6xx.cpp b/clang/test/CXX/drs/dr6xx.cpp
--- a/clang/test/CXX/drs/dr6xx.cpp
+++ b/clang/test/CXX/drs/dr6xx.cpp
@@ -1083,13 +1083,23 @@
   // Also see dr1395.
 
   namespace temp_func_order_example2 {
-    template <typename T, typename U> struct A {};
-    template <typename T, typename U> void f(U, A<U, T> *p = 0); // expected-note {{candidate}}
-    template <typename U> int &f(U, A<U, U> *p = 0); // expected-note {{candidate}}
+    template <typename... T> struct A1 {}; // expected-error 0-1{{C++11}}
+    template <typename U, typename... T> struct A2 {}; // expected-error 0-1{{C++11}}
+    template <class T1, class... U> void e1(A1<T1, U...>) = delete; // expected-error 0-2{{C++11}}
+    template <class T1> void e1(A1<T1>);
+    template <class T1, class... U> void e2(A2<T1, U...>) = delete; // expected-error 0-2{{C++11}}
+    template <class T1> void e2(A2<T1>);
+    template <typename T, typename U> void f(U, A1<U, T> *p = 0) = delete; // expected-note {{candidate}} expected-error 0-1{{C++11}}
+    template <typename U> int &f(U, A1<U, U> *p = 0); // expected-note {{candidate}}
     template <typename T> void g(T, T = T()); // expected-note {{candidate}}
     template <typename T, typename... U> void g(T, U...); // expected-note {{candidate}} expected-error 0-1{{C++11}}
     void h() {
-      int &r = f<int>(42, (A<int, int> *)0);
+      A1<int, int> a;
+      int &r = f<int>(42, &a);
+      A1<int> b1;
+      e1(b1);
+      A2<int> b2;
+      e2(b2);
       f<int>(42); // expected-error {{ambiguous}}
       g(42); // expected-error {{ambiguous}}
     }