re PR c++/79652 (ICE on invalid c++ code in warn_extern_redeclared_static in cp/decl.c:1231)

2017-05-25  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/79652
	* g++.dg/cpp0x/pr79652.C: New.

From-SVN: r248474

gcc/testsuite/ChangeLog

 2017-05-25  Paolo Carlini  <paolo.carlini@oracle.com>
 
+	PR c++/79652
+	* g++.dg/cpp0x/pr79652.C: New.
+
+2017-05-25  Paolo Carlini  <paolo.carlini@oracle.com>
+
 	PR c++/71451
 	* g++.dg/cpp0x/variadic170.C: New.
 

gcc/testsuite/g++.dg/cpp0x/pr79652.C

+// { dg-do compile { target c++11 } }
+
+namespace {
+  struct S {
+    int n;
+  } T;
+  using T = decltype(S :: n);  // { dg-error "redeclared" }
+  namespace {
+    extern int x;
+    extern int x;
+  }
+}