Loops in Python 2.4-2.6 loop come_from

Looks like Python 2.4-2.6 may have a COME_FROM(_LOOP)
before the jump_back.

Fixes Issue #123

test/simple_source/bug26/03_loop_if_cf.py

@@ -0,0 +1,19 @@
+# Bug in < 2.6 is having a COME_FROM_LOOP (but we
+# don't tag that so it is just COME_FROM *before*
+# a jump back to the loop.
+def pickup(self, open_players, open_buf, wrap_buf):
+   for aplayer in self._game.active_players:
+
+      if aplayer in open_players:
+         aplayer.send(open_players)
+
+         if self == aplayer:
+            for awatcher in self._watchers:
+               if awatcher._can_see_detail:
+                  awatcher.send(open_buf)
+               else:
+                  awatcher.send(wrap_buf)
+         else:
+            self._game.send(aplayer.side)
+      else:
+         self._game.send(aplayer.side, wrap_buf)

uncompyle6/parsers/parse26.py

@@ -84,6 +84,12 @@ class Python26Parser(Python2Parser):
         ja_cf_pop ::= JUMP_ABSOLUTE come_froms POP_TOP
         jf_cf_pop ::= JUMP_FORWARD come_froms POP_TOP
 
+        # The first optional COME_FROM when it appears is really
+        # COME_FROM_LOOP, but in <= 2.6 we don't distinguish
+        # this
+
+        cf_jb_cf_pop ::= _come_from JUMP_BACK come_froms POP_TOP
+
         bp_come_from    ::= POP_BLOCK COME_FROM
         jb_bp_come_from ::= JUMP_BACK bp_come_from
 
@@ -111,7 +117,8 @@ class Python26Parser(Python2Parser):
         break_stmt ::= BREAK_LOOP JUMP_BACK
 
         # Semantic actions want else_suitel to be at index 3
-        ifelsestmtl ::= testexpr c_stmts_opt jb_cf_pop else_suitel
+        ifelsestmtl ::= testexpr c_stmts_opt cf_jb_cf_pop else_suitel
+
         ifelsestmtc ::= testexpr c_stmts_opt ja_cf_pop else_suitec
 
         # Semantic actions want suite_stmts_opt to be at index 3