re PR c++/82022 (constexpr lambda in template context: expression ‘<lambda>’ is…

re PR c++/82022 (constexpr lambda in template context: expression ‘<lambda>’ is not a constant expression)

2018-03-05  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/82022
	* g++.dg/cpp1z/constexpr-lambda20.C: New.

From-SVN: r258241

gcc/testsuite/ChangeLog

+2018-03-05  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/82022
+	* g++.dg/cpp1z/constexpr-lambda20.C: New.
+
 2018-03-03  Harald Anlauf  <anlauf@gmx.de>
 
 	PR fortran/71085

gcc/testsuite/g++.dg/cpp1z/constexpr-lambda20.C

+// PR c++/82022
+// { dg-options -std=c++17 }
+
+template <class T>
+void f2()
+{
+  constexpr bool r = []() constexpr { return false; }();
+  if constexpr (r);
+  if constexpr ([]() constexpr { return false; }());
+}
+
+int main()
+{
+  if constexpr ([]() constexpr { return false; }());
+  f2<int>();
+}