gcc/cp/ChangeLog:
	* name-lookup.c (get_std_name_hint): New function.
	(maybe_suggest_missing_header): New function.
	(suggest_alternative_in_explicit_scope): Call
	maybe_suggest_missing_header.

gcc/testsuite/ChangeLog:
	* g++.dg/lookup/missing-std-include.C: New test file.

From-SVN: r247240