Bugfix: apply_intrinsic and iapply must not destructively

manipulate argument lists.

* eval.c (apply_frob_args): Rewrite to non-destructive
one-pass version.
(iapply): Likewise.

* lib.c (term): New function.

* lib.h (term): Declared.

1 files changed, 7 insertions, 0 deletions

diff --git a/lib.c b/lib.c
index bb0d580f..e84b098f 100644
--- a/lib.c
+++ b/lib.c
@@ -408,6 +408,13 @@ loc tail(val cons)
   return cdr_l(cons);
 }
 
+loc term(loc head)
+{
+  while (consp(deref(head)))
+    head = cdr_l(deref(head));
+  return head;
+}
+
 loc lastcons(val list)
 {
   loc ret = nulloc;