re PR c++/87122 (ICE in tsubst_decomp_names)

	PR c++/87122
	* pt.c (tsubst_expr) <case RANGE_FOR_STMT>: If
	processing_template_decl and decl is structured binding decl, call
	cp_finish_decomp.

	* g++.dg/cpp1z/decomp47.C: New test.

From-SVN: r263953

gcc/cp/ChangeLog

+2018-08-29  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/87122
+	* pt.c (tsubst_expr) <case RANGE_FOR_STMT>: If
+	processing_template_decl and decl is structured binding decl, call
+	cp_finish_decomp.
+
 2018-08-28  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/86546

gcc/cp/pt.c

@@ -16832,6 +16832,8 @@ tsubst_expr (tree t, tree args, tsubst_flags_t complain, tree in_decl,
 	    RANGE_FOR_IVDEP (stmt) = RANGE_FOR_IVDEP (t);
 	    RANGE_FOR_UNROLL (stmt) = RANGE_FOR_UNROLL (t);
 	    finish_range_for_decl (stmt, decl, expr);
+	    if (decomp_first && decl != error_mark_node)
+	      cp_finish_decomp (decl, decomp_first, decomp_cnt);
 	  }
 	else
 	  {

gcc/testsuite/ChangeLog

+2018-08-29  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/87122
+	* g++.dg/cpp1z/decomp47.C: New test.
+
 2018-08-29  Matthew Malcomson  <matthew.malcomson@arm.com>
 
 	* gcc.target/aarch64/simd/vect_su_add_sub.c: Use 32 and 64-bit types

gcc/testsuite/g++.dg/cpp1z/decomp47.C

+// PR c++/87122
+// { dg-do run { target c++14 } }
+// { dg-options "" }
+
+extern "C" void abort ();
+struct S { int a, b; };
+int c;
+
+template <int N>
+void
+foo ()
+{
+  S x[4] = { { N, 2 }, { 3, 4 }, { 5, 6 }, { 7, 8 } };
+  auto f = [](auto & y) {
+    for (auto & [ u, v ] : y)	// { dg-warning "structured bindings only available with" "" { target c++14_down } }
+      {
+	if ((u & 1) != 1 || v != u + 1 || u < N || u > 7 || (c & (1 << u))
+	    || &u != &y[v / 2 - 1].a || &v != &y[v / 2 - 1].b)
+	  abort ();
+	c |= 1 << u;
+      }
+  };
+  f (x);
+}
+
+int
+main ()
+{
+  foo<1> ();
+  if (c != 0xaa)
+    abort ();
+}