re PR c++/64954 (GCC incorrectly rejects constexpr variable initialization.)

2017-09-20  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/64954
	* g++.dg/cpp0x/constexpr-ctor20.C: New.

From-SVN: r253002

gcc/testsuite/ChangeLog

+2017-09-20  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/64954
+	* g++.dg/cpp0x/constexpr-ctor20.C: New.
+
 2017-09-20  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/81373

gcc/testsuite/g++.dg/cpp0x/constexpr-ctor20.C

+// PR c++/64954
+// { dg-do compile { target c++11 } }
+
+struct A {};
+int main() {
+    A a;
+    constexpr A b = a;
+}