[Bug c++/77869] New: ICE on a code piece

["ab at fmap dot me" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77869

            Bug ID: 77869
           Summary: ICE on a code piece
           Product: gcc
           Version: 6.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ab at fmap dot me
  Target Milestone: ---

Created attachment 39758
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39758&action=edit
test.cpp

This piece of code (minimized as far as I tried) causes a segfault on GCCs
6.2.0 and 6.2.1. Clang compiles the piece correctly. I'm not sure what's going
on here -- it seems related to a friend class when the class name is typedef'd
in the parent with involvement of templates.

If there's anything more that is helpful to nail this bug down, I'll be happy
to help!