list_seq: return lazy list, not eager.

* lib.c (list_seq_func): New static function.
(list_seq): Convert to lazy processing. The iterator is
threaded through the lazy cons's car field, so we don't have
to mutate the function's environment.

* txr.1: Added note about list-seq producing a lazy list.

1 files changed, 4 insertions, 0 deletions

diff --git a/txr.1 b/txr.1
index 119bc1d4..bb8cf70f 100644
--- a/txr.1
+++ b/txr.1
@@ -29688,6 +29688,10 @@ and
 functions convert an iterable object of any type into a list, vector
 or string, respectively.
 
+The list returned by
+.code list-seq
+is lazy.
+
 The
 .code list-seq
 and