Pattern vars accessed from Lisp now dynamic.

* eval.c (set_dyn_env): Static function becomes external.

* eval.h (set_dyn_env): Declared.

* match.c (eval_with_bindings, eval_progn_with_bindings):
Evaluate Lisp code in null lexical environment. Instead
install the pattern variables as dynamic, so they shadow
global variables. A compatibility check for 121 or earlier
provides the old behavior.

* txr.1: Document scoping rules, and added compatibility
notes.

1 files changed, 1 insertions, 1 deletions

diff --git a/eval.c b/eval.c
index 21e1dcea..62841f6e 100644
--- a/eval.c
+++ b/eval.c
@@ -926,7 +926,7 @@ static void do_eval_args(val form, val env, val ctx_form,
   }
 }
 
-static val set_dyn_env(val de)
+val set_dyn_env(val de)
 {
   val old = dyn_env;
   dyn_env = de;