================
@@ -178,6 +178,56 @@ RangeSelector transformer::encloseNodes(std::string 
BeginID,
   return transformer::enclose(node(std::move(BeginID)), 
node(std::move(EndID)));
 }
 
+RangeSelector transformer::merge(RangeSelector First, RangeSelector Second) {
+  return [First,
+          Second](const MatchResult &Result) -> Expected<CharSourceRange> {
+    Expected<CharSourceRange> FirstRange = First(Result);
+    if (!FirstRange)
+      return FirstRange.takeError();
+    Expected<CharSourceRange> SecondRange = Second(Result);
+    if (!SecondRange)
+      return SecondRange.takeError();
+    // Result begin loc is the minimum of the begin locs of the two ranges.
+    SourceLocation B = FirstRange->getBegin() < SecondRange->getBegin()
----------------
yuhaouy wrote:

Thanks! Fixed.

https://github.com/llvm/llvm-project/pull/169560
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