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-rw-r--r--lib/Core/ExecutionState.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Core/ExecutionState.h b/lib/Core/ExecutionState.h
index 2ae22284..25cf5ee2 100644
--- a/lib/Core/ExecutionState.h
+++ b/lib/Core/ExecutionState.h
@@ -229,6 +229,9 @@ public:
   /// @ brief The patch number, starting from 1; 0 being the original.
   std::uint64_t patchNo = 0;
 
+  /// @ brief Environment variable for runtime metaprogram switching.
+  std::string metaEnvVar = "";
+
   /// @ brief Terminated on exit, awaiting comparison.
   std::string formula = "";