PR c++/84752 - ICE with capture of constexpr array.

	* call.c (standard_conversion): Set rvaluedness_matches_p on the
	identity conversion under ck_lvalue.

From-SVN: r258406

gcc/cp/ChangeLog

 2018-03-09  Jason Merrill  <jason@redhat.com>
+
+	PR c++/84752 - ICE with capture of constexpr array.
+	* call.c (standard_conversion): Set rvaluedness_matches_p on the
+	identity conversion under ck_lvalue.
+
+2018-03-09  Jason Merrill  <jason@redhat.com>
 	    Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/71169

gcc/cp/call.c

@@ -103,7 +103,7 @@ struct conversion {
      being bound to an rvalue expression.  If KIND is ck_rvalue,
      true when we are treating an lvalue as an rvalue (12.8p33).  If
      KIND is ck_base, always false.  If ck_identity, we will be
-     binding a reference directly.  */
+     binding a reference directly or decaying to a pointer.  */
   BOOL_BITFIELD rvaluedness_matches_p: 1;
   BOOL_BITFIELD check_narrowing: 1;
   /* The type of the expression resulting from the conversion.  */
@@ -1139,6 +1139,8 @@ standard_conversion (tree to, tree from, tree expr, bool c_cast_p,
     {
       from = type_decays_to (from);
       fcode = TREE_CODE (from);
+      /* Tell convert_like_real that we're using the address.  */
+      conv->rvaluedness_matches_p = true;
       conv = build_conv (ck_lvalue, from, conv);
     }
   /* Wrapping a ck_rvalue around a class prvalue (as a result of using

gcc/testsuite/g++.dg/cpp0x/lambda/lambda-array3.C

+// PR c++/84752
+// { dg-do compile { target c++11 } }
+
+void foo()
+{
+  constexpr int x[1] = {};
+  [&x]{ return (bool)x; };
+}
+