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-rw-r--r--clang/lib/Tooling/Syntax/BuildTree.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/clang/lib/Tooling/Syntax/BuildTree.cpp b/clang/lib/Tooling/Syntax/BuildTree.cpp
index b36b8e00f7c..22cdb89b7bf 100644
--- a/clang/lib/Tooling/Syntax/BuildTree.cpp
+++ b/clang/lib/Tooling/Syntax/BuildTree.cpp
@@ -209,6 +209,8 @@ private:
};
/// Maps from the start token to a subtree starting at that token.
+ /// Keys in the map are pointers into the array of expanded tokens, so
+ /// pointer order corresponds to the order of preprocessor tokens.
/// FIXME: storing the end tokens is redundant.
/// FIXME: the key of a map is redundant, it is also stored in NodeForRange.
std::map<const syntax::Token *, NodeAndRole> Trees;
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