Function SCIPcreateConsNonlinear 

pub unsafe extern "C" fn SCIPcreateConsNonlinear(
    scip: *mut SCIP,
    cons: *mut *mut SCIP_CONS,
    name: *const c_char,
    expr: *mut SCIP_EXPR,
    lhs: f64,
    rhs: f64,
    initial: c_uint,
    separate: c_uint,
    enforce: c_uint,
    check: c_uint,
    propagate: c_uint,
    local: c_uint,
    modifiable: c_uint,
    dynamic: c_uint,
    removable: c_uint,
) -> SCIP_RETCODE

creates and captures a nonlinear constraint

@note the constraint gets captured, hence at one point you have to release it using the method SCIPreleaseCons()