Support nil env in env-fbind and env-vbind.

* eval.c (env_fbind, env_vbind): Allow env to be
nil, indicating that the binding is to take
place in the global environment.

* txr.1: Documented.

1 files changed, 6 insertions, 0 deletions

diff --git a/txr.1 b/txr.1
index eb2f379a..9585fdaf 100644
--- a/txr.1
+++ b/txr.1
@@ -14245,6 +14245,12 @@ already exists in the environment, in the given space, then its
 value is updated with
 .codn value .
 
+If
+.meta env
+is specified as
+.codn nil ,
+then the binding takes place in the global environment.
+
 .SS* Global Environment
 .coNP Accessors @, symbol-function @ symbol-macro and @ symbol-value
 .synb