2 files changed, 42 insertions, 0 deletions

diff --git a/clang/lib/Serialization/ASTReaderStmt.cpp b/clang/lib/Serialization/ASTReaderStmt.cpp
index 0c802a6b098..7eb56e16ead 100644
--- a/clang/lib/Serialization/ASTReaderStmt.cpp
+++ b/clang/lib/Serialization/ASTReaderStmt.cpp
@@ -734,6 +734,24 @@ void ASTStmtReader::VisitUnaryExprOrTypeTraitExpr(UnaryExprOrTypeTraitExpr *E) {
   E->setRParenLoc(ReadSourceLocation());
 }
 
+void ASTStmtReader::VisitConceptSpecializationExpr(
+        ConceptSpecializationExpr *E) {
+  VisitExpr(E);
+  unsigned NumTemplateArgs = Record.readInt();
+  E->NestedNameSpec = Record.readNestedNameSpecifierLoc();
+  E->TemplateKWLoc = Record.readSourceLocation();
+  E->ConceptNameLoc = Record.readSourceLocation();
+  E->FoundDecl = ReadDeclAs<NamedDecl>();
+  E->NamedConcept.setPointer(ReadDeclAs<ConceptDecl>());
+  const ASTTemplateArgumentListInfo *ArgsAsWritten =
+      Record.readASTTemplateArgumentListInfo();
+  llvm::SmallVector<TemplateArgument, 4> Args;
+  for (unsigned I = 0; I < NumTemplateArgs; ++I)
+    Args.push_back(Record.readTemplateArgument());
+  E->setTemplateArguments(ArgsAsWritten, Args);
+  E->NamedConcept.setInt(Record.readInt() == 1);
+}
+
 void ASTStmtReader::VisitArraySubscriptExpr(ArraySubscriptExpr *E) {
   VisitExpr(E);
   E->setLHS(Record.readSubExpr());
@@ -3490,6 +3508,12 @@ Stmt *ASTReader::ReadStmtFromStream(ModuleFile &F) {
     case EXPR_DEPENDENT_COAWAIT:
       S = new (Context) DependentCoawaitExpr(Empty);
       break;
+
+    case EXPR_CONCEPT_SPECIALIZATION:
+      unsigned numTemplateArgs = Record[ASTStmtReader::NumExprFields];
+      S = ConceptSpecializationExpr::Create(Context, Empty, numTemplateArgs);
+      break;
+      
     }
 
     // We hit a STMT_STOP, so we're done with this expression.
diff --git a/clang/lib/Serialization/ASTWriterStmt.cpp b/clang/lib/Serialization/ASTWriterStmt.cpp
index 387ed44f1ab..deba1ccb0e5 100644
--- a/clang/lib/Serialization/ASTWriterStmt.cpp
+++ b/clang/lib/Serialization/ASTWriterStmt.cpp
@@ -388,6 +388,24 @@ void ASTStmtWriter::VisitDependentCoawaitExpr(DependentCoawaitExpr *E) {
   Code = serialization::EXPR_DEPENDENT_COAWAIT;
 }
 
+void ASTStmtWriter::VisitConceptSpecializationExpr(
+        ConceptSpecializationExpr *E) {
+  VisitExpr(E);
+  ArrayRef<TemplateArgument> TemplateArgs = E->getTemplateArguments();
+  Record.push_back(TemplateArgs.size());
+  Record.AddNestedNameSpecifierLoc(E->getNestedNameSpecifierLoc());
+  Record.AddSourceLocation(E->getTemplateKWLoc());
+  Record.AddSourceLocation(E->getConceptNameLoc());
+  Record.AddDeclRef(E->getFoundDecl());
+  Record.AddDeclRef(E->getNamedConcept());
+  Record.AddASTTemplateArgumentListInfo(E->getTemplateArgsAsWritten());
+  for (const TemplateArgument &Arg : TemplateArgs)
+    Record.AddTemplateArgument(Arg);
+  Record.push_back(E->isSatisfied());
+  Code = serialization::EXPR_CONCEPT_SPECIALIZATION;
+}
+
+
 void ASTStmtWriter::VisitCapturedStmt(CapturedStmt *S) {
   VisitStmt(S);
   // NumCaptures