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-rw-r--r--crawl-ref/source/externs.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/crawl-ref/source/externs.h b/crawl-ref/source/externs.h
index 41885c7f7a..97c91451fb 100644
--- a/crawl-ref/source/externs.h
+++ b/crawl-ref/source/externs.h
@@ -2221,6 +2221,7 @@ private:
typedef std::map<std::string, std::string> string_map;
string_map aliases;
string_map variables;
+ std::set<std::string> constants; // Variables that can't be changed
std::set<std::string> included; // Files we've included already.
public: