[Bug c++/88368] New: Improper ``use of deleted function''

[serge.guelton@telecom-bretagne.eu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88368

            Bug ID: 88368
           Summary: Improper ``use of deleted function''
           Product: gcc
           Version: 8.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: serge.guelton@telecom-bretagne.eu
  Target Milestone: ---

The following code fails to compile: https://godbolt.org/z/briQXa
Adding a `noexcept` specifier to the default constructor fixes the issue, but
it shouldn't be needed..

Clang compiles this code correctly, so does gcc 4.9. But gcc 7.3 doesn't, for
another reason.