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-rw-r--r--clang/lib/Serialization/ASTWriter.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index 55b557c0471..d5824354154 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -4458,6 +4458,9 @@ void ASTWriter::WriteASTCore(Sema &SemaRef,
StringRef FileName = (*M)->FileName;
LE.write<uint16_t>(FileName.size());
Out.write(FileName.data(), FileName.size());
+
+ // These values should be unique within a chain, since they will be read
+ // as keys into ContinuousRangeMaps.
LE.write<uint32_t>((*M)->SLocEntryBaseOffset);
LE.write<uint32_t>((*M)->BaseIdentifierID);
LE.write<uint32_t>((*M)->BaseMacroID);
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