decomp14.C: New test.

	* g++.dg/cpp1z/decomp14.C: New test.
	* g++.dg/cpp1z/decomp15.C: New test.
	* g++.dg/cpp1z/decomp16.C: New test.

From-SVN: r242435

gcc/testsuite/ChangeLog

 2016-11-15  Jakub Jelinek  <jakub@redhat.com>
 
+	* g++.dg/cpp1z/decomp14.C: New test.
+	* g++.dg/cpp1z/decomp15.C: New test.
+	* g++.dg/cpp1z/decomp16.C: New test.
+
 	* g++.dg/cpp1z/decomp13.C: New test.
 
 	* g++.dg/cpp1y/auto-fn33.C (main): Turn // error: ... into dg-bogus.

gcc/testsuite/g++.dg/cpp1z/decomp14.C

+// { dg-do compile { target c++11 } }
+// { dg-options "" }
+
+struct A { int f; };
+struct B { int b; };
+struct C : virtual A {};
+struct D : virtual A {};
+struct E { int f; };
+struct F : A { int f; };
+struct G : A, E {};
+struct H : C, D {};
+struct I : A, C {};		// { dg-warning "due to ambiguity" }
+struct J : B {};
+struct K : B, virtual J {};	// { dg-warning "due to ambiguity" }
+struct L : virtual J {};
+struct M : virtual J, L {};
+
+void
+foo (C &c, F &f, G &g, H &h, I &i, K &k, M &m)
+{
+  auto [ ci ] = c;		// { dg-warning "decomposition declaration only available with" "" { target c++14_down } }
+  auto [ fi ] = f;		// { dg-error "cannot decompose class type 'F': both it and its base class 'A' have non-static data members" }
+				// { dg-warning "decomposition declaration only available with" "" { target c++14_down } .-1 }
+  auto [ gi ] = g;		// { dg-error "cannot decompose class type 'G': its base classes 'A' and 'E' have non-static data members" }
+				// { dg-warning "decomposition declaration only available with" "" { target c++14_down } .-1 }
+  auto [ hi ] = h;		// { dg-warning "decomposition declaration only available with" "" { target c++14_down } }
+  auto [ ki ] = k;		// { dg-error "'B' is an ambiguous base of 'K'" }
+				// { dg-warning "decomposition declaration only available with" "" { target c++14_down } .-1 }
+  auto [ mi ] = m;		// { dg-warning "decomposition declaration only available with" "" { target c++14_down } }
+}

gcc/testsuite/g++.dg/cpp1z/decomp15.C

+// { dg-do compile }
+// { dg-options "-std=c++1z" }
+
+struct A { bool a, b; };
+struct B { int a, b; };
+
+void
+foo ()
+{
+  auto [ a, b ] = A ();
+  for (auto [ a, b ] = A (); a; )
+    ;
+  if (auto [ a, b ] = A (); a)
+    ;
+  switch (auto [ a, b ] = B (); b)
+    {
+    case 2:
+      break;
+    }
+  auto && [ c, d ] = A ();
+  [[maybe_unused]] auto [ e, f ] = A ();
+  alignas (A) auto [ g, h ] = A ();
+  __attribute__((unused)) auto [ i, j ] = A ();
+}

gcc/testsuite/g++.dg/cpp1z/decomp16.C

+// { dg-do compile }
+// { dg-options "-std=c++1z" }
+
+struct A { bool a, b; };
+struct B { int a, b; };
+
+void
+foo ()
+{
+  auto [ a, b ] = A ();
+  for (; auto [ a, b ] = A (); )			// { dg-error "expected" }
+    ;
+  for (; false; auto [ a, b ] = A ())			// { dg-error "expected" }
+    ;
+  if (auto [ a, b ] = A ())				// { dg-error "expected" }
+    ;
+  if (auto [ a, b ] = A (); auto [ c, d ] = A ())	// { dg-error "expected" }
+    ;
+  if (int d = 5; auto [ a, b ] = A ())			// { dg-error "expected" }
+    ;
+  switch (auto [ a, b ] = B ())				// { dg-error "expected" }
+    {
+    case 2:
+      break;
+    }
+  switch (int d = 5; auto [ a, b ] = B ())		// { dg-error "expected" }
+    {
+    case 2:
+      break;
+    }
+  A e = A ();
+  auto && [ c, d ] = e;
+  auto [ i, j ] = A (), [ k, l ] = A ();		// { dg-error "expected" }
+  auto m = A (), [ n, o ] = A ();			// { dg-error "expected" }
+}
+
+template <typename T>
+auto [ a, b ] = A ();					// { dg-error "expected" }
+
+struct C
+{
+  auto [ e, f ] = A ();					// { dg-error "expected" }
+  mutable auto [ g, h ] = A ();				// { dg-error "expected" }
+  virtual auto [ i, j ] = A ();				// { dg-error "expected" }
+  explicit auto [ k, l ] = A ();			// { dg-error "expected" }
+  friend auto [ m, n ] = A ();				// { dg-error "expected" }
+};