[Bug c++/95883] New: Attributes on lambdas appear to be parsed in the wrong place

["drewb at valvesoftware dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95883

            Bug ID: 95883
           Summary: Attributes on lambdas appear to be parsed in the wrong
                    place
           Product: gcc
           Version: 9.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: drewb at valvesoftware dot com
  Target Milestone: ---

Created attachment 48782
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48782&action=edit
Artificial source test case

In 90333 there's a discussion of where attributes on lambdas should be
processed.  In 8.3 they were handled after the declarator but that regressed in
9.  90333 says that it was fixed to work properly after the declarator and that
they also added support for attributes before the declarator.  However in
testing against 9.3 attributes after the declarator do not work so it does not
look like the fix is working.

cppreference says that lambda attributes should come after the declarator. 
Testing with godbolt it looks like attributes after the declarator are the
common case (for example clang works on the test case and fails with attributes
before the declarator).