correct for second argument when (is)/2 is a tail call

2020-05-16 20:22:17 -06:00
parent a38fb41e37
commit 05d3b97eae
3 changed files with 92 additions and 60 deletions
--- a/src/prolog/machine/system_calls.rs
+++ b/src/prolog/machine/system_calls.rs
@@ -4272,7 +4272,7 @@ impl MachineState {
                        self.fail = non_quoted_token(once(c));
                    }
                    Addr::Con(h) => {
-	                if let HeapCellValue::Atom(atom, _) = &self.heap[h] {
+	                    if let HeapCellValue::Atom(atom, _) = &self.heap[h] {
                            self.fail = non_quoted_token(atom.as_str().chars());
                        }
                    }