Crack down on redefinitions of built-ins.

* eval.c (builtin, eval_initing): New global variable.
(op_defun, op_defmacro): During initialization, record functions
and macros in builtin hash.
(builtin_reject_test): New static function.
(expand_macrolet): Perform builtin reject test for fbind, lbind,
and macrolet.
(regfun, reg_mac): Add symbol to builtin hash.
(eval_init): GC-protect new hash table variable and initialize it.
Set eval_initing to true over eval initialization.
The flip function is renamed fo flipargs.
(eval_compat_fixup): New function, for dealing with the
operator/function conflict over flip.

* eval.h (eval_compat_fixup): Declared.

* lib.c (compat_fixup): Call eval_compat_fixup.

* tests/011/macros-2.txr: This test was defining a macro called
while which is now illegal. Renamed to whilst.

* tests/011/macros-2.expected: Regenerated.

* txr.1:  Function flip renamed to flipargs and documented in
Compatibility section.

1 files changed, 1 insertions, 0 deletions

diff --git a/lib.c b/lib.c
index e9f4b630..ad83e91a 100644
--- a/lib.c
+++ b/lib.c
@@ -7334,6 +7334,7 @@ int compat_fixup(int compat_ver)
     symbol_setname(process_error_s, lit("process_error"));
   }
 
+  eval_compat_fixup(compat_ver);
   return 0;
 }