re PR c++/71182 (parser.c cp_lexer_previous_token sanitizer detects member call on null pointer)

	PR c++/71182
	* parser.c (cp_lexer_previous_token): Use vec_safe_address in the
	assertion, as lexer->buffer may be NULL.

	* g++.dg/cpp0x/pr71182.C: New test.

From-SVN: r244070

gcc/cp/ChangeLog

+2017-01-04  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/71182
+	* parser.c (cp_lexer_previous_token): Use vec_safe_address in the
+	assertion, as lexer->buffer may be NULL.
+
 2017-01-04  Marek Polacek  <polacek@redhat.com>
 
 	PR c++/77545

gcc/cp/parser.c

@@ -766,7 +766,7 @@ cp_lexer_previous_token (cp_lexer *lexer)
   /* Skip past purged tokens.  */
   while (tp->purged_p)
     {
-      gcc_assert (tp != lexer->buffer->address ());
+      gcc_assert (tp != vec_safe_address (lexer->buffer));
       tp--;
     }
 

gcc/testsuite/ChangeLog

+2017-01-04  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/71182
+	* g++.dg/cpp0x/pr71182.C: New test.
+
 2017-01-04  Kelvin Nilsen  <kelvin@gcc.gnu.org>
 
 	PR target/78056

gcc/testsuite/g++.dg/cpp0x/pr71182.C

+// PR c++/71182
+// { dg-do compile { target c++11 } }
+
+class A {
+  template <typename> void As();
+};
+template <typename T> class B : A {
+  void f() {
+    A *g ;
+    g ? g->As<T>() : nullptr;
+  }
+};