Index: lib/StaticAnalyzer/Checkers/RetainCountChecker.cpp
===================================================================
--- lib/StaticAnalyzer/Checkers/RetainCountChecker.cpp
+++ lib/StaticAnalyzer/Checkers/RetainCountChecker.cpp
@@ -1930,7 +1930,7 @@
 }
 
 static Optional<std::string> describeRegion(const MemRegion *MR) {
-  if (const auto *VR = dyn_cast_or_null<VarRegion>(MR))
+  if (dyn_cast_or_null<VarRegion>(MR))
     return std::string(cast<VarRegion>(MR)->getDecl()->getName());
   // Once we support more storage locations for bindings,
   // this would need to be improved.