1 files changed, 16 insertions, 4 deletions

diff --git a/source/Symbol/CompilerDeclContext.cpp b/source/Symbol/CompilerDeclContext.cpp
index 43a83bbca77b..a6f046c4eb22 100644
--- a/source/Symbol/CompilerDeclContext.cpp
+++ b/source/Symbol/CompilerDeclContext.cpp
@@ -1,9 +1,8 @@
 //===-- CompilerDeclContext.cpp ---------------------------------*- C++ -*-===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -60,6 +59,19 @@ bool CompilerDeclContext::IsClassMethod(lldb::LanguageType *language_ptr,
     return false;
 }
 
+bool CompilerDeclContext::IsContainedInLookup(CompilerDeclContext other) const {
+  if (!IsValid())
+    return false;
+
+  // If the other context is just the current context, we don't need to go
+  // over the type system to know that the lookup is identical.
+  if (this == &other)
+    return true;
+
+  return m_type_system->DeclContextIsContainedInLookup(m_opaque_decl_ctx,
+                                                       other.m_opaque_decl_ctx);
+}
+
 bool lldb_private::operator==(const lldb_private::CompilerDeclContext &lhs,
                               const lldb_private::CompilerDeclContext &rhs) {
   return lhs.GetTypeSystem() == rhs.GetTypeSystem() &&