re PR c++/84306 (Wrong overload selected with -std=c++17, explicit and {})

	PR c++/84306
	* g++.dg/overload/conv-op3.C: New test.

From-SVN: r262345

gcc/testsuite/ChangeLog

@@ -3,6 +3,9 @@
 	PR middle-end/86202
 	* gcc.dg/Wint-conversion-2.c: New test.
 
+	PR c++/84306
+	* g++.dg/overload/conv-op3.C: New test.
+
 2018-07-03  Richard Biener  <rguenther@suse.de>
 
 	PR ipa/86389

gcc/testsuite/g++.dg/overload/conv-op3.C

+// c++/84306
+// { dg-do link { target c++11 } }
+
+struct foo {
+  foo() = default;
+
+  foo(foo const&);
+
+  template<typename T>
+  explicit foo(T&&) { }
+};
+
+int
+main()
+{
+  foo f1;
+  foo f2{f1};
+}