Function SCIPcliqueSearchVar 

pub unsafe extern "C" fn SCIPcliqueSearchVar(
    clique: *mut SCIP_CLIQUE,
    var: *mut SCIP_VAR,
    value: c_uint,
) -> c_int

returns the position of the given variable/value pair in the clique; returns -1 if variable/value pair is not member of the clique