twa_graph: fix set_univ_init_state() with initializer_list

Reported by Thomas Medioni.

* spot/twa/twagraph.hh (set_univ_init_state): Remove the bogus
template parameter.
* tests/core/twagraph.cc, tests/core/tgbagraph.test: Test the method.
* NEWS: Mention the bug.

NEWS

@@ -35,6 +35,9 @@ New in spot 2.3.1.dev (not yet released)
     would always report 'weak' automata.  Both variants now report the
     most precise between 'weak' or 'terminal'.
 
+  - spot::twa_graph::set_univ_init_state() could not be called with
+    an initializer list.
+
   Deprecation notices:
 
   - Using --format=%a to print the number of atomic propositions in

spot/twa/twagraph.hh

@@ -277,7 +277,6 @@ namespace spot
       init_number_ = g_.new_univ_dests(dst_begin, dst_end);
     }
 
-    template<class I>
     void set_univ_init_state(const std::initializer_list<state_num>& il)
     {
       set_univ_init_state(il.begin(), il.end());

tests/core/tgbagraph.test

 #!/bin/sh
 # -*- coding: utf-8 -*-
-# Copyright (C) 2014, 2015, 2016 Laboratoire de Recherche et Développement
-# de l'Epita (LRDE).
+# Copyright (C) 2014-2017 Laboratoire de Recherche et Développement de
+# l'Epita (LRDE).
 #
 # This file is part of Spot, a model checking library.
 #
@@ -254,6 +254,22 @@ State: 1
 State: 2
 [t] 1
 --END--
+HOA: v1.1
+States: 3
+Start: 2&0
+AP: 0
+acc-name: all
+Acceptance: 0 t
+properties: univ-branch trans-labels explicit-labels state-acc complete
+properties: deterministic
+--BODY--
+State: 0
+[t] 0
+State: 1
+[t] 0
+State: 2
+[t] 0&1
+--END--
 EOF
 
 diff stdout expected

tests/core/twagraph.cc

 // -*- coding: utf-8 -*-
-// Copyright (C) 2014, 2015, 2016 Laboratoire de Recherche et Développement
-// de l'Epita.
+// Copyright (C) 2014-2017 Laboratoire de Recherche et Développement
+// de l'Epita (LRDE).
 //
 // This file is part of Spot, a model checking library.
 //
@@ -129,9 +129,27 @@ static void f3()
   spot::print_hoa(std::cout, tg, "1.1") << '\n';
 }
 
+// Test creation of universal edges via initializer-list
+static void f4()
+{
+  auto d = spot::make_bdd_dict();
+  auto tg = make_twa_graph(d);
+
+  auto s1 = tg->new_state();
+  auto s2 = tg->new_state();
+  auto s3 = tg->new_state();
+  tg->set_univ_init_state({s3, s1});
+  tg->new_univ_edge(s3, {s1, s2}, bddtrue);
+  tg->new_univ_edge(s2, {s1}, bddtrue);
+  tg->new_edge(s1, s1, bddtrue);
+
+  spot::print_hoa(std::cout, tg, "1.1") << '\n';
+}
+
 int main()
 {
   f1();
   f2();
   f3();
+  f4();
 }