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, 0 deletions

diff --git a/eval.h b/eval.h
index 8ea4e652..2791626b 100644
--- a/eval.h
+++ b/eval.h
@@ -84,6 +84,7 @@ val expand_quasi(val quasi_forms, val menv);
 val load(val target);
 val expand(val form, val menv);
 val expand_forms(val forms, val menv);
+val expand_with_free_refs(val form, val menv_in, val upto_menv_in);
 val prof_call(val (*fun)(mem_t *ctx), mem_t *ctx);
 val bindable(val obj);
 val mapcarv(val fun, struct args *lists);