diff --git a/clang/lib/AST/Interp/ByteCodeExprGen.h b/clang/lib/AST/Interp/ByteCodeExprGen.h
--- a/clang/lib/AST/Interp/ByteCodeExprGen.h
+++ b/clang/lib/AST/Interp/ByteCodeExprGen.h
@@ -80,6 +80,7 @@
   bool VisitSubstNonTypeTemplateParmExpr(const SubstNonTypeTemplateParmExpr *E);
   bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E);
   bool VisitInitListExpr(const InitListExpr *E);
+  bool VisitCXXParenListInitExpr(const CXXParenListInitExpr *E);
   bool VisitConstantExpr(const ConstantExpr *E);
   bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E);
   bool VisitMemberExpr(const MemberExpr *E);
@@ -199,6 +200,8 @@
     return this->emitPopPtr(I);
   }
 
+  bool visitInitList(ArrayRef<const Expr *> Inits, const Expr *E);
+
   /// Creates a local primitive value.
   unsigned allocateLocalPrimitive(DeclTy &&Decl, PrimType Ty, bool IsConst,
                                   bool IsExtended = false);
diff --git a/clang/lib/AST/Interp/ByteCodeExprGen.cpp b/clang/lib/AST/Interp/ByteCodeExprGen.cpp
--- a/clang/lib/AST/Interp/ByteCodeExprGen.cpp
+++ b/clang/lib/AST/Interp/ByteCodeExprGen.cpp
@@ -511,6 +511,58 @@
   return this->emitArrayElemPtrPop(IndexT, E);
 }
 
+template <class Emitter>
+bool ByteCodeExprGen<Emitter>::visitInitList(ArrayRef<const Expr *> Inits,
+                                             const Expr *E) {
+  assert(E->getType()->isRecordType());
+  const Record *R = getRecord(E->getType());
+
+  unsigned InitIndex = 0;
+  for (const Expr *Init : Inits) {
+    if (!this->emitDupPtr(E))
+      return false;
+
+    if (std::optional<PrimType> T = classify(Init)) {
+      const Record::Field *FieldToInit = R->getField(InitIndex);
+      if (!this->visit(Init))
+        return false;
+      if (!this->emitInitField(*T, FieldToInit->Offset, E))
+        return false;
+      if (!this->emitPopPtr(E))
+        return false;
+      ++InitIndex;
+    } else {
+      // Initializer for a direct base class.
+      if (const Record::Base *B = R->getBase(Init->getType())) {
+        if (!this->emitGetPtrBasePop(B->Offset, Init))
+          return false;
+
+        if (!this->visitInitializer(Init))
+          return false;
+
+        if (!this->emitPopPtr(E))
+          return false;
+        // Base initializers don't increase InitIndex, since they don't count
+        // into the Record's fields.
+      } else {
+        const Record::Field *FieldToInit = R->getField(InitIndex);
+        // Non-primitive case. Get a pointer to the field-to-initialize
+        // on the stack and recurse into visitInitializer().
+        if (!this->emitGetPtrField(FieldToInit->Offset, Init))
+          return false;
+
+        if (!this->visitInitializer(Init))
+          return false;
+
+        if (!this->emitPopPtr(E))
+          return false;
+        ++InitIndex;
+      }
+    }
+  }
+  return true;
+}
+
 template <class Emitter>
 bool ByteCodeExprGen<Emitter>::VisitInitListExpr(const InitListExpr *E) {
   // Handle discarding first.
@@ -530,56 +582,8 @@
   }
 
   QualType T = E->getType();
-  if (T->isRecordType()) {
-    const Record *R = getRecord(T);
-
-    unsigned InitIndex = 0;
-    for (const Expr *Init : E->inits()) {
-      if (!this->emitDupPtr(E))
-        return false;
-
-      if (std::optional<PrimType> T = classify(Init)) {
-        const Record::Field *FieldToInit = R->getField(InitIndex);
-        if (!this->visit(Init))
-          return false;
-
-        if (!this->emitInitField(*T, FieldToInit->Offset, E))
-          return false;
-
-        if (!this->emitPopPtr(E))
-          return false;
-        ++InitIndex;
-      } else {
-        // Initializer for a direct base class.
-        if (const Record::Base *B = R->getBase(Init->getType())) {
-          if (!this->emitGetPtrBasePop(B->Offset, Init))
-            return false;
-
-          if (!this->visitInitializer(Init))
-            return false;
-
-          if (!this->emitPopPtr(E))
-            return false;
-          // Base initializers don't increase InitIndex, since they don't count
-          // into the Record's fields.
-        } else {
-          const Record::Field *FieldToInit = R->getField(InitIndex);
-          // Non-primitive case. Get a pointer to the field-to-initialize
-          // on the stack and recurse into visitInitializer().
-          if (!this->emitGetPtrField(FieldToInit->Offset, Init))
-            return false;
-
-          if (!this->visitInitializer(Init))
-            return false;
-
-          if (!this->emitPopPtr(E))
-            return false;
-          ++InitIndex;
-        }
-      }
-    }
-    return true;
-  }
+  if (T->isRecordType())
+    return this->visitInitList(E->inits(), E);
 
   if (T->isArrayType()) {
     // FIXME: Array fillers.
@@ -612,6 +616,21 @@
   return false;
 }
 
+template <class Emitter>
+bool ByteCodeExprGen<Emitter>::VisitCXXParenListInitExpr(
+    const CXXParenListInitExpr *E) {
+  if (DiscardResult) {
+    for (const Expr *Init : E->getInitExprs()) {
+      if (!this->discard(Init))
+        return false;
+    }
+    return true;
+  }
+
+  assert(E->getType()->isRecordType());
+  return this->visitInitList(E->getInitExprs(), E);
+}
+
 template <class Emitter>
 bool ByteCodeExprGen<Emitter>::VisitSubstNonTypeTemplateParmExpr(
     const SubstNonTypeTemplateParmExpr *E) {
diff --git a/clang/test/AST/Interp/records.cpp b/clang/test/AST/Interp/records.cpp
--- a/clang/test/AST/Interp/records.cpp
+++ b/clang/test/AST/Interp/records.cpp
@@ -941,7 +941,7 @@
   static_assert(foo(F()) == 0, "");
 }
 
-namespace ZeroInit {
+  namespace ZeroInit {
   struct F {
     int a;
   };
@@ -1052,3 +1052,17 @@
   };
 #endif
 }
+
+#if __cplusplus >= 202002L
+namespace ParenInit {
+  struct A {
+    int a;
+  };
+
+  struct B : A {
+    int b;
+  };
+
+  constexpr B b(A(1),2);
+}
+#endif
diff --git a/clang/test/SemaCXX/source_location.cpp b/clang/test/SemaCXX/source_location.cpp
--- a/clang/test/SemaCXX/source_location.cpp
+++ b/clang/test/SemaCXX/source_location.cpp
@@ -4,9 +4,9 @@
 // RUN: %clang_cc1 -std=c++1z -fcxx-exceptions -fms-extensions -DMS -fexceptions -verify %s
 // RUN: %clang_cc1 -std=c++2a -fcxx-exceptions -fms-extensions -DMS -DUSE_CONSTEVAL -fexceptions -verify %s
 //
-/// FIXME: The -DPAREN_INIT one is missing for the new interpreter.
 // RUN: %clang_cc1 -std=c++1z -fcxx-exceptions -fexceptions -fexperimental-new-constant-interpreter -DNEW_INTERP -verify %s
 // RUN: %clang_cc1 -std=c++2a -fcxx-exceptions -DUSE_CONSTEVAL -fexceptions -fexperimental-new-constant-interpreter -DNEW_INTERP -verify %s
+// RUN: %clang_cc1 -std=c++2b -fcxx-exceptions -DUSE_CONSTEVAL -DPAREN_INIT -fexceptions -fexperimental-new-constant-interpreter -DNEW_INTERP -verify %s
 // RUN: %clang_cc1 -std=c++1z -fcxx-exceptions -fms-extensions -DMS -fexceptions -fexperimental-new-constant-interpreter -DNEW_INTERP -verify %s
 // RUN: %clang_cc1 -std=c++2a -fcxx-exceptions -fms-extensions -DMS -DUSE_CONSTEVAL -fexceptions -fexperimental-new-constant-interpreter -DNEW_INTERP -verify %s
 // expected-no-diagnostics