[Bug c++/91608] New: [10 warning] wrong comma-subscript warning

[h2+bugs at fsfe dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91608

            Bug ID: 91608
           Summary: [10 warning] wrong comma-subscript warning
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: h2+bugs at fsfe dot org
  Target Milestone: ---

With gcc10 and std=c++2a I am seeing

error: top-level comma expression in array subscript is deprecated
[-Werror=comma-subscript]

on 

return names[meta::find_index<types, type>::value];

But that's not a top-level comma-expression. It's part of the template
specialisation...