(svn r8341) -Codechange (r8336): added assert to VehTypeToIndex() to ensure valid vehicle types in the argument

src/vehicle.h

@@ -429,6 +429,7 @@ static inline bool IsPlayerBuildableVehicleType(const Vehicle *v)
  */
 static inline byte VehTypeToIndex(byte type)
 {
+	assert(IsPlayerBuildableVehicleType(type));
 	return type - VEH_Train;
 }