txr: repeat ferrets out Lisp-embedded vars.

Gone is the need for :vars to inform @(repeat)/@(rep) about
variable references buried in Lisp.

* eval.c (expand_with_free_refs): Change to external linkage.

* eval.h (expand_with_free_refs): Declared.

* parser.y (extract_vars): Handle sys:expr forms, which are
embedded Lisp via expand_with_free_refs to uncover their free
variables.

* txr.1: Redocumented this area.

1 files changed, 1 insertions, 1 deletions

diff --git a/eval.c b/eval.c
index d5c438eb..1091432d 100644
--- a/eval.c
+++ b/eval.c
@@ -5040,7 +5040,7 @@ static val gather_free_refs_nw(val info_cons, val exc,
   return uw_rthrow(continue_s, nil);
 }
 
-static val expand_with_free_refs(val form, val menv_in, val upto_menv_in)
+val expand_with_free_refs(val form, val menv_in, val upto_menv_in)
 {
   val ret;
   val menv = default_null_arg(menv_in);