Function SCIPevalExprQuadraticAuxNonlinear 

pub unsafe extern "C" fn SCIPevalExprQuadraticAuxNonlinear(
    scip: *mut SCIP,
    expr: *mut SCIP_EXPR,
    sol: *mut SCIP_SOL,
) -> f64

evaluates quadratic term in a solution w.r.t. auxiliary variables

\note This requires that for every expr used in the quadratic data, a variable or auxiliary variable is available.