eliminate inner_numbervar_count

src/prolog/heap_print.rs

@@ -312,7 +312,6 @@ pub struct HCPrinter<'a, Outputter> {
     heap_locs: ReverseHeapVarDict,
     printed_vars: IndexSet<Addr>,
     last_item_idx: usize,
-    inner_numbervar_count: usize,
     cyclic_terms: IndexMap<Addr, usize>,
     pub(crate) var_names: IndexMap<Addr, Var>,
     pub(crate) numbervars_offset: Integer,
@@ -441,7 +440,6 @@ impl<'a, Outputter: HCValueOutputter> HCPrinter<'a, Outputter> {
             last_item_idx: 0,
             numbervars: false,
             numbervars_offset: Integer::from(0),
-            inner_numbervar_count: 0,
             quoted: false,
             ignore_ops: false,
             cyclic_terms: IndexMap::new(),