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-rw-r--r--src/newgrf_config.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/newgrf_config.h b/src/newgrf_config.h
index bb82732ef..56a62ba9c 100644
--- a/src/newgrf_config.h
+++ b/src/newgrf_config.h
@@ -44,6 +44,7 @@ enum GRFBugs {
GBUG_VEH_LENGTH, ///< Length of rail vehicle changes when not inside a depot
GBUG_VEH_REFIT, ///< Articulated vehicles carry different cargos resp. are differently refittable than specified in purchase list
GBUG_VEH_POWERED_WAGON, ///< Powered wagon changed poweredness state when not inside a depot
+ GBUG_UNKNOWN_CB_RESULT, ///< A callback returned an unknown/invalid result
};
/** Status of post-gameload GRF compatibility check */