Function grin_core::libtx::build::with_excess

pub fn with_excess<K, B>(excess: BlindingFactor) -> Box<Append<K, B>> where
    K: Keychain,
    B: ProofBuild, 

Adds a known excess value on the transaction being built. Usually used in combination with the initial_tx function when a new transaction is built by adding to a pre-existing one.