* name-lookup.c (get_std_name_hint): Add std::byte.

From-SVN: r279471

gcc/cp/ChangeLog

+2019-12-17  Jason Merrill  <jason@redhat.com>
+
+	* name-lookup.c (get_std_name_hint): Add std::byte.
+
 2019-12-17  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/59655

gcc/cp/name-lookup.c

@@ -5641,6 +5641,8 @@ get_std_name_hint (const char *name)
     /* <condition_variable>. */
     {"condition_variable", "<condition_variable>", cxx11},
     {"condition_variable_any", "<condition_variable>", cxx11},
+    /* <cstddef>.  */
+    {"byte", "<cstddef>", cxx17},
     /* <deque>.  */
     {"deque", "<deque>", cxx98},
     /* <forward_list>.  */

gcc/testsuite/g++.dg/lookup/missing-std-include-9.C

+std::byte b;		 // { dg-error "byte" }
+// { dg-message "cstddef" "" { target c++17 } .-1 }
+// { dg-message "C..17" "" { target c++14_down } .-2 }