Constant UNCERTIFIED_LENGTH 

pub const UNCERTIFIED_LENGTH: &str = "a certified length of a station piece no bound here reaches: an offset of a banked curve, a \
     3D intrinsic curve with torsion or out of a level plane, a chain's parametric piece or an \
     elevated curve with an intrinsic profile in a leaning frame; a 3D offset direction that is \
     not vertical beside a plan-measured or intrinsic base; a base placed in a frame that tilts \
     +Z; a skewed frame; or a tolerance below the points' rounding";

The input a length no certified bound here reaches is refused for.