1 files changed, 4 insertions, 0 deletions
diff --git a/clang/lib/Serialization/ASTWriterDecl.cpp b/clang/lib/Serialization/ASTWriterDecl.cpp
index 459e61713ed..472136d99a1 100644
--- a/clang/lib/Serialization/ASTWriterDecl.cpp
+++ b/clang/lib/Serialization/ASTWriterDecl.cpp
@@ -1675,6 +1675,8 @@ void ASTDeclWriter::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
   // For an expanded parameter pack, record the number of expansion types here
   // so that it's easier for deserialization to allocate the right amount of
   // memory.
+  Expr *TypeConstraint = D->getPlaceholderTypeConstraint();
+  Record.push_back(!!TypeConstraint);
   if (D->isExpandedParameterPack())
     Record.push_back(D->getNumExpansionTypes());
 
@@ -1682,6 +1684,8 @@ void ASTDeclWriter::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
   // TemplateParmPosition.
   Record.push_back(D->getDepth());
   Record.push_back(D->getPosition());
+  if (TypeConstraint)
+    Record.AddStmt(TypeConstraint);
 
   if (D->isExpandedParameterPack()) {
     for (unsigned I = 0, N = D->getNumExpansionTypes(); I != N; ++I) {