Misc things to try to get the warnings module to work

src/runtime/builtin_modules/builtins.cpp

@@ -371,7 +371,7 @@ BoxedModule* builtins_module;
 
 // TODO looks like CPython and pypy put this into an "exceptions" module:
 BoxedClass* Exception, *AssertionError, *AttributeError, *TypeError, *NameError, *KeyError, *IndexError, *IOError,
-    *OSError, *ZeroDivisionError, *ValueError, *UnboundLocalError, *RuntimeError, *ImportError, *StopIteration;
+    *OSError, *ZeroDivisionError, *ValueError, *UnboundLocalError, *RuntimeError, *ImportError, *StopIteration, *Warning;
 
 const ObjectFlavor exception_flavor(&boxGCHandler, NULL);
 Box* exceptionNew1(BoxedClass* cls) {
@@ -459,6 +459,9 @@ void setupBuiltins() {
     RuntimeError = makeBuiltinException(Exception, "RuntimeError");
     ImportError = makeBuiltinException(Exception, "ImportError");
     StopIteration = makeBuiltinException(Exception, "StopIteration");
+    Warning = makeBuiltinException(Exception, "Warning");
+    /*ImportWarning =*/ makeBuiltinException(Warning, "ImportWarning");
+    /*PendingDeprecationWarning =*/ makeBuiltinException(Warning, "PendingDeprecationWarning");
 
     repr_obj = new BoxedFunction(boxRTFunction((void*)repr, UNKNOWN, 1));
     builtins_module->giveAttr("repr", repr_obj);

src/runtime/builtin_modules/sys.cpp

@@ -87,6 +87,9 @@ void setupSys() {
     sys_module->giveAttr("stdout", new BoxedFile(stdout));
     sys_module->giveAttr("stdin", new BoxedFile(stdin));
     sys_module->giveAttr("stderr", new BoxedFile(stderr));
+
+    sys_module->giveAttr("warnoptions", new BoxedList());
+    sys_module->giveAttr("py3kwarning", False);
 }
 
 void setupSysEnd() {

src/runtime/types.cpp

@@ -75,6 +75,8 @@ extern "C" BoxedFunction::BoxedFunction(CLFunction* f)
         this->giveAttr("__module__", modname);
     }
 
+    this->giveAttr("__doc__", None);
+
     assert(f->num_defaults == ndefaults);
 }
 
@@ -97,6 +99,8 @@ extern "C" BoxedFunction::BoxedFunction(CLFunction* f, std::initializer_list<Box
         this->giveAttr("__module__", modname);
     }
 
+    this->giveAttr("__doc__", None);
+
     assert(f->num_defaults == ndefaults);
 }