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-rw-r--r--src/util/system.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/util/system.h b/src/util/system.h
index a7f4d16911..64585cbfac 100644
--- a/src/util/system.h
+++ b/src/util/system.h
@@ -175,6 +175,7 @@ public:
// ALLOW_STRING = 0x08, //!< unimplemented, draft implementation in #16545
// ALLOW_LIST = 0x10, //!< unimplemented, draft implementation in #16545
DISALLOW_NEGATION = 0x20, //!< disallow -nofoo syntax
+ DISALLOW_ELISION = 0x40, //!< disallow -foo syntax that doesn't assign any value
DEBUG_ONLY = 0x100,
/* Some options would cause cross-contamination if values for