[Bug c++/84896] New: Better handling of missing <utility> for std::pair

[dmalcolm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84896

            Bug ID: 84896
           Summary: Better handling of missing <utility> for std::pair
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dmalcolm at gcc dot gnu.org
  Target Milestone: ---

gcc 8 currently emits the following for:

  std::pair<int, int> foo;

error: 'pair' in namespace 'std' does not name a template type
 std::pair<int, int> foo;
      ^~~~

We ought to suggest including <utility> for this, and probably various other
stdlib templates.