Function compose_g2_product 

pub fn compose_g2_product(
    left: &KappaLabel<71>,
    right: &KappaLabel<71>,
) -> Result<AddressOutcome<71>, CompositionFailure>

CS-G2 under σ-axis Sha256Hasher.

Errors

• CompositionFailure::OperandSigmaAxisMismatch — an operand’s σ-axis prefix is not "sha256".
• CompositionFailure::MalformedOperand — an operand is not a well-formed κ-label.
• CompositionFailure::PipelineFailure — defensive.