Fix for pr2924354.

Creation of implicit nets requires knowledge of whether an identifier
has been declared before it is used. Currently implicit nets are
created during elaboration, but by this stage the order of declaration
and use is not known. This patch moves the creation of implicit nets
into the parser stage.

Module.cc

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998-2009 Stephen Williams ([email protected])
+ * Copyright (c) 1998-2010 Stephen Williams ([email protected])
  *
  *    This source code is free software; you can redistribute it
  *    and/or modify it in source code form under the terms of the GNU
@@ -33,7 +33,6 @@ Module::Module(perm_string n)
       library_flag = false;
       is_cell = false;
       uc_drive = UCD_NONE;
-      default_nettype = NetNet::NONE;
       timescale_warn_done = false;
 }
 
@@ -105,4 +104,3 @@ const list<PGate*>& Module::get_gates() const
 {
       return gates_;
 }
-