pt.c (process_partial_specialization): Say "not deducible" rather than "not used".

	* pt.c (process_partial_specialization): Say "not deducible"
	rather than "not used".  Use inform.

From-SVN: r209000

gcc/cp/ChangeLog

 2014-04-01  Jason Merrill  <jason@redhat.com>
 
+	* pt.c (process_partial_specialization): Say "not deducible"
+	rather than "not used".  Use inform.
+
 	PR c++/60374
 	* pt.c (coerce_template_parms): Check that the pack expansion
 	pattern works with the first matching parameter.

gcc/cp/pt.c

@@ -4139,15 +4139,17 @@ process_partial_specialization (tree decl)
   for (i = 0; i < ntparms; ++i)
     if (tpd.parms[i] == 0)
       {
-	/* One of the template parms was not used in the
+	/* One of the template parms was not used in a deduced context in the
 	   specialization.  */
 	if (!did_error_intro)
 	  {
-	    error ("template parameters not used in partial specialization:");
+	    error ("template parameters not deducible in "
+		   "partial specialization:");
 	    did_error_intro = true;
 	  }
 
-	error ("        %qD", TREE_VALUE (TREE_VEC_ELT (inner_parms, i)));
+	inform (input_location, "        %qD",
+		TREE_VALUE (TREE_VEC_ELT (inner_parms, i)));
       }
 
   if (did_error_intro)

gcc/testsuite/g++.dg/cpp0x/pr31439.C

 // { dg-do compile { target c++11 } }
 template<typename...> struct A;
 
-template<char> struct A<> {}; // { dg-error "not used in partial specialization|anonymous|declaration" }
+template<char> struct A<> {}; // { dg-error "not deducible|anonymous|declaration" }
 
 template<typename T, typename... U> struct A<T, U...> : A<U...> {}; // { dg-error "incomplete type" }
 

gcc/testsuite/g++.dg/cpp0x/vt-33964.C

@@ -6,7 +6,7 @@ struct foo
 };
 
 template<typename ... Args>
-struct foo< typename Args::is_applied... > // { dg-error "not used|Args" }
+struct foo< typename Args::is_applied... > // { dg-error "not deducible|Args" }
 {
     static bool const value = false;
 };

gcc/testsuite/g++.dg/template/crash97.C

@@ -2,7 +2,7 @@
 
 template<typename> struct A {};
 
-template<typename> struct A<int> // { dg-error "not used|template\\-parameter" }
+template<typename> struct A<int> // { dg-error "not deducible|template\\-parameter" }
 {
   template<int> void foo();
 };

gcc/testsuite/g++.dg/template/crash98.C

@@ -2,7 +2,7 @@
 
 template < typename > struct A;
 
-template < typename > struct A < int > // { dg-error "not used|template\\-parameter|declaration" }
+template < typename > struct A < int > // { dg-error "not deducible|template\\-parameter|declaration" }
 {
   int i;
   int f ();

gcc/testsuite/g++.dg/template/partial5.C

@@ -4,7 +4,7 @@ template<typename T>
 struct X { };
 
 template<typename T>
-struct X<typename T::foo> { }; // { dg-error "not used|T" }
+struct X<typename T::foo> { }; // { dg-error "not deducible|T" }
 
 template<int N>
 struct X<int[N]> {}; // okay
@@ -14,7 +14,7 @@ template<typename T, typename T::foo V>
 struct Y { };
 
 template<typename T, typename U, U v>
-struct Y<T, v> { }; // { dg-error "not used|U" }
+struct Y<T, v> { }; // { dg-error "not deducible|U" }
 
 
 template<typename T, T V>