1 files changed, 7 insertions, 1 deletions
diff --git a/lib/Serialization/ASTWriter.cpp b/lib/Serialization/ASTWriter.cpp
index 5e9e650fce..aef3523116 100644
--- a/lib/Serialization/ASTWriter.cpp
+++ b/lib/Serialization/ASTWriter.cpp
@@ -6070,10 +6070,16 @@ void ASTRecordWriter::AddTemplateParameterList(
   AddSourceLocation(TemplateParams->getTemplateLoc());
   AddSourceLocation(TemplateParams->getLAngleLoc());
   AddSourceLocation(TemplateParams->getRAngleLoc());
-  // TODO: Concepts
+
   Record->push_back(TemplateParams->size());
   for (const auto &P : *TemplateParams)
     AddDeclRef(P);
+  if (const Expr *RequiresClause = TemplateParams->getRequiresClause()) {
+    Record->push_back(true);
+    AddStmt(const_cast<Expr*>(RequiresClause));
+  } else {
+    Record->push_back(false);
+  }
 }
 
 /// Emit a template argument list.