Function SCIPgetNLPVarsNonlinearity 

pub unsafe extern "C" fn SCIPgetNLPVarsNonlinearity(
    scip: *mut SCIP,
    nlcount: *mut c_int,
) -> SCIP_RETCODE

computes for each variables the number of NLP rows in which the variable appears in the nonlinear part

@pre This method can be called if SCIP is in one of the following stages: - \ref SCIP_STAGE_INITSOLVE - \ref SCIP_STAGE_SOLVING