Make it a warning only when built-ins redefined.

* eval.c (builtin_reject_test): Issue warnings rather than
errors when built-in macros, functions or operators are
redefined. For now, we don't provide any way to suppress the
warning.

1 files changed, 4 insertions, 4 deletions

diff --git a/eval.c b/eval.c
index eece7f3d..815689f0 100644
--- a/eval.c
+++ b/eval.c
@@ -1947,11 +1947,11 @@ static void builtin_reject_test(val op, val sym, val form)
     } else if (opt_compat && opt_compat <= 107) {
       /* empty */
     } else if (builtin_kind) {
-      eval_error(form, lit("~s: cannot bind ~s, which is a built-in ~s"),
-                 op, sym, builtin_kind, nao);
+      eval_warn(form, lit("~s: redefining ~s, which is a built-in ~s"),
+                op, sym, builtin_kind, nao);
     } else if (is_operator) {
-      eval_error(form, lit("~s: cannot bind ~s, which is a built-in operator"),
-                 op, sym, nao);
+      eval_warn(form, lit("~s: redefining ~s, which is a built-in operator"),
+                op, sym, nao);
     }
 }