txr: allow variable to span vertical function.

* match.c (v_var_compat, v_var): New static functions.
(match_files): No longer recognize v_var specially; it is now
handled via vertical table.
(dir_tables_init): Register a vertical sys:var directive also
via v_var function.
(match_compat_fixup): New function.

* txr.c (compat): Call match_compat_fixup.

* tests/010/span-var.txr: New file.

* txr.1: Documented.

1 files changed, 1 insertions, 0 deletions

diff --git a/match.h b/match.h
index 95667158..3314345b 100644
--- a/match.h
+++ b/match.h
@@ -40,3 +40,4 @@ void match_reg_var(val sym);
 void match_reg_params(val params);
 void match_reg_elem(val elem);
 void match_init(void);
+void match_compat_fixup(int compat_ver);