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Tested with 0.48.11 and PPA 0.50.0 nightly.

The following Vala method:

	public bool funcall (string name, long? uniarg=null) {
		assert (uniarg == null);
		return LispFunc.find (name).func (((uniarg == null) ? 1 : uniarg), leNIL);
	}

generates the following C:

gboolean
lisp_funcall (const gchar* name,
              glong* uniarg)
{
	glong* _tmp0_ = NULL;
	LispFunc* _tmp2_;
	LispFunc* _tmp3_;
	LispFunction _tmp4_;
	Lexp* _tmp5_;
	gboolean _tmp6_;
	gboolean result = FALSE;
	g_return_val_if_fail (name != NULL, FALSE);
	_vala_assert (uniarg == NULL, "uniarg == null");
	if (uniarg == NULL) {
		glong _tmp1_;
		_tmp1_ = (glong) 1;
		_tmp0_ = &_tmp1_;
	} else {
		_tmp0_ = uniarg;
	}
	_tmp2_ = lisp_func_find (name);
	_tmp3_ = _tmp2_;
	_tmp4_ = _tmp3_->func;
	_tmp5_ = leNIL;
	_tmp6_ = _tmp4_ (*_tmp0_, _tmp5_);
	_lisp_func_unref0 (_tmp3_);
	result = _tmp6_;
	return result;
}

The problem here is that in the C, _tmp1_ is referred to implicitly after it goes out of scope.

(As usual, sorry if I overlooked a dupe—I searched for "scope", "variable", and tried the "Code generator" label. If I've managed to overlook a dupe again, I would appreciate hints on how I could search better!)