Index: clang/lib/AST/ASTContext.cpp
===================================================================
--- clang/lib/AST/ASTContext.cpp
+++ clang/lib/AST/ASTContext.cpp
@@ -6245,11 +6245,14 @@
         auto *TYTCArgs = TYTC->getTemplateArgsAsWritten();
         if (TXTCArgs->NumTemplateArgs != TYTCArgs->NumTemplateArgs)
           return false;
+
         llvm::FoldingSetNodeID XID, YID;
-        for (auto &ArgLoc : TXTCArgs->arguments())
-          ArgLoc.getArgument().Profile(XID, X->getASTContext());
-        for (auto &ArgLoc : TYTCArgs->arguments())
-          ArgLoc.getArgument().Profile(YID, Y->getASTContext());
+        auto *XConstraint = TXTC->getImmediatelyDeclaredConstraint();
+        auto *YConstraint = TYTC->getImmediatelyDeclaredConstraint();
+        if (XConstraint)
+          XConstraint->Profile(XID, *this, /*Canonical=*/true);
+        if (YConstraint)
+          YConstraint->Profile(YID, *this, /*Canonical=*/true);
         if (XID != YID)
           return false;
       }
Index: clang/test/Modules/concept.cppm
===================================================================
--- clang/test/Modules/concept.cppm
+++ clang/test/Modules/concept.cppm
@@ -18,6 +18,9 @@
 template <class _Tp>
 concept __member_size = requires(_Tp &&t) { t.size(); };
 
+template <class First, class Second>
+concept C = requires(First x, Second y) { x+y; };
+
 struct A {
 public:
   template <Range T>
@@ -29,6 +32,11 @@
   constexpr __integer_like auto operator()(_Tp&& __t) const {
     return __t.size();
   }
+
+  template <__integer_like _Tp, C<_Tp> Sentinel>
+  constexpr _Tp operator()(_Tp &&__t, Sentinel &&last) const {
+    return __t;
+  }
 };
 #endif
 
@@ -51,4 +59,5 @@
         auto operator+(S s) { return 0; }
     };
     __fn{}(S());
+    __fn{}(S(), S());
 }