From cedef16f546b8ebf99dd6097f39e61b22a3f5ad9 Mon Sep 17 00:00:00 2001
From: Robert Widmann <devteam.codafi@gmail.com>
Date: Fri, 11 Sep 2020 13:54:39 -0600
Subject: [PATCH] [NFC] Mark SourceManager::getIDForBufferIdentifier const

---
 include/swift/Basic/SourceManager.h | 2 +-
 lib/Basic/SourceLoc.cpp             | 5 ++---
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/include/swift/Basic/SourceManager.h b/include/swift/Basic/SourceManager.h
index a12aa169f7c..1ec679af6d6 100644
--- a/include/swift/Basic/SourceManager.h
+++ b/include/swift/Basic/SourceManager.h
@@ -169,7 +169,7 @@ public:
 
   /// Returns a buffer ID for a previously added buffer with the given
   /// buffer identifier, or None if there is no such buffer.
-  Optional<unsigned> getIDForBufferIdentifier(StringRef BufIdentifier);
+  Optional<unsigned> getIDForBufferIdentifier(StringRef BufIdentifier) const;
 
   /// Returns the identifier for the buffer with the given ID.
   ///
diff --git a/lib/Basic/SourceLoc.cpp b/lib/Basic/SourceLoc.cpp
index ac29f693fc2..b8ade6561ef 100644
--- a/lib/Basic/SourceLoc.cpp
+++ b/lib/Basic/SourceLoc.cpp
@@ -152,9 +152,8 @@ SourceManager::getVirtualFile(SourceLoc Loc) const {
   return nullptr;
 }
 
-
-Optional<unsigned> SourceManager::getIDForBufferIdentifier(
-    StringRef BufIdentifier) {
+Optional<unsigned>
+SourceManager::getIDForBufferIdentifier(StringRef BufIdentifier) const {
   auto It = BufIdentIDMap.find(BufIdentifier);
   if (It == BufIdentIDMap.end())
     return None;