* eval.c (expand_place): Unnecessary, buggy function removed.

It was handling silly special cases with the net effect of being
nearly equivalent to just expand, while failing to expand places
which are compound macro calls. It did diagnose nonexistent place
types at expansion time, which isn't worth much.
(expand): All the expansions for the mutating operator sset, inc, dec,
push, pop and flip were also pointless and have been removed.  they did
the precise equivalent of doing expand(rest(form)), and consing the
symbol to the front, which is the fallback case for function call
forms.

1 files changed, 3 insertions, 78 deletions

diff --git a/eval.c b/eval.c
index fca33ab3..efe4f1d1 100644
--- a/eval.c
+++ b/eval.c
@@ -1963,56 +1963,6 @@ static val expand_cond_pairs(val form, val menv)
   }
 }
 
-static val expand_place(val place, val menv)
-{
-  if (atom(place)) {
-    return expand(place, menv);
-  } else {
-    val sym = first(place);
-    if (sym == dwim_s) {
-      val args = rest(place);
-      val args_ex = expand_forms(args, menv);
-
-      if (args == args_ex)
-        return place;
-
-      return rlcp(cons(sym, args_ex), place);
-    } if (sym == gethash_s) {
-      val hash = second(place);
-      val key = third(place);
-      val dfl_val = fourth(place);
-      val hash_ex = expand(hash, menv);
-      val key_ex = expand(key, menv);
-      val dfl_val_ex = expand(dfl_val, menv);
-
-      if (hash == hash_ex && key == key_ex && dfl_val == dfl_val_ex)
-        return place;
-
-      return rlcp(cons(sym, cons(hash_ex, cons(key_ex, 
-                                               cons(dfl_val_ex, nil)))), 
-                  place);
-    } else if (sym == car_s || sym == cdr_s) {
-      val cell = second(place);
-      val cell_ex = expand(cell, menv);
-      if (cell == cell_ex)
-        return place;
-      return cons(sym, cons(cell_ex, nil));
-    } else if (sym == vecref_s) {
-      val vec = second(place);
-      val vec_ex = expand(vec, menv);
-      val ind = third(place);
-      val ind_ex = expand(ind, menv);
-
-      if (vec == vec_ex && ind == ind_ex)
-        return place;
-      return rlcp(cons(sym, cons(vec_ex, cons(ind_ex, nil))), place);
-    } else {
-      eval_error(place, lit("unrecognized place: ~s"), place, nao);
-    }
-    abort();
-  }
-}
-
 static val expand_qquote(val qquoted_form, val menv)
 {
   if (nilp(qquoted_form)) {
@@ -2442,32 +2392,6 @@ tail:
       if (params_ex == params && expr_ex == expr && body_ex == body)
         return form;
       return rlcp(cons(sym, cons(params_ex, cons(expr_ex, body_ex))), form);
-    } else if (sym == set_s || sym == inc_s || sym == dec_s) {
-      val place = second(form);
-      val inc = third(form);
-      val place_ex = expand_place(place, menv);
-      val inc_ex = expand(inc, menv);
-
-      if (place == place_ex && inc == inc_ex)
-        return form;
-      if (inc == nil)
-        return rlcp(cons(sym, cons(place_ex, nil)), form);
-      return rlcp(cons(sym, cons(place_ex, cons(inc_ex, nil))), form);
-    } else if (sym == push_s) {
-      val inc = second(form);
-      val inc_ex = expand(inc, menv);
-      val place = third(form);
-      val place_ex = expand_place(place, menv);
-
-      if (place == place_ex && inc == inc_ex)
-        return form;
-      return rlcp(cons(sym, cons(inc_ex, cons(place_ex, nil))), form);
-    } else if (sym == pop_s || sym == flip_s) {
-      val place = second(form);
-      val place_ex = expand_place(place, menv);
-      if (place == place_ex)
-        return form;
-      return rlcp(cons(sym, cons(place_ex, nil)), form);
     } else if (sym == quote_s || sym == fun_s) {
       return form;
     } else if (sym == qquote_s) {
@@ -2529,7 +2453,7 @@ tail:
     } else if (sym == catch_s) {
       return expand_catch(rest(form), menv);
     } else if (sym == regex_s || regexp(sym)) {
-      return form;
+      return form; /* regex syntax isn't Lisp code; don't expand! */
     } else if (sym == macro_time_s) {
       val args = rest(form);
       val args_ex = expand_forms(args, menv);
@@ -2559,7 +2483,8 @@ tail:
     } else {
       /* funtion call
          also handles: progn, prog1, call, if, and, or, 
-         unwind-protect, return, dwim  */
+         unwind-protect, return, dwim, set, inc, dec,
+         push, pop, flip. */
       val args = rest(form);
       val args_ex = expand_forms(args, menv);