re PR c++/79790 ([C++17] ICE class template argument deduction failed)

/cp
2017-08-04  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/79790
	* pt.c (do_class_deduction): Handle the case of no viable implicit
	deduction guides; simplify the code generating implicit deduction
	guides.

/testsuite
2017-08-04  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/79790
	* g++.dg/cpp1z/class-deduction42.C: New.

From-SVN: r250883

gcc/testsuite/ChangeLog

 2017-08-04  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/79790
-	* g++.dg/cpp1z/class-deduction42.C: New.
+	* g++.dg/cpp1z/class-deduction43.C: New.
 
 2017-08-04  Yury Gribov  <tetra2005@gmail.com>
 

gcc/testsuite/g++.dg/cpp1z/class-deduction43.C

+// PR c++/79790
+// { dg-options -std=c++1z }
+
+template <int N>
+struct array
+{
+  int a [N];
+};
+
+array a = { 1, 2, 3 };  // { dg-error "cannot deduce" }