re PR c++/54987 (missed ambiguity in template function call)

2015-03-25  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/54987
	* g++.dg/template/pr54987.C: New.

From-SVN: r221668

gcc/testsuite/ChangeLog

+2015-03-25  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/54987
+	* g++.dg/template/pr54987.C: New.
+
 2015-03-25  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/62630

gcc/testsuite/g++.dg/template/pr54987.C

+// PR c++/54987
+
+struct Argument1
+{
+};
+
+struct Argument2
+{
+};
+
+template<typename T>
+struct Template1
+{
+  Template1() {}
+
+  template<typename Y>
+  Template1( const Template1<Y>& ) {}
+};
+
+template<typename T>
+struct Template2
+{
+  Template2() {}
+
+  template<typename Y>
+  Template2( const Template1<Y>& ) {}
+};
+
+template <typename T>
+struct make_type
+{
+  typedef Argument1 type;
+};
+
+template<typename T>
+void foo( T, Template1<typename make_type<T>::type> )
+{
+}
+
+template<typename T>
+void foo( T, Template2<typename make_type<T>::type> )
+{
+}
+
+int main()
+{
+  Template1<Argument2> t;
+  Argument1 a;
+  foo( a, t );  // { dg-error "ambiguous" }
+  return 0;
+}