[Bug libstdc++/94199] New: std::experimental::net::v1::make_service function template not instantiatable

[erich.keane at intel dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94199

            Bug ID: 94199
           Summary: std::experimental::net::v1::make_service function
                    template not instantiatable
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: erich.keane at intel dot com
  Target Milestone: ---

Discovered in Clang, since Clang diagnoses the issue without an instantiation,
here is a GCC repro: https://godbolt.org/z/7guiic

The function template tries to throw service_already_exists, which isn't
default constructible:


/opt/compiler-explorer/gcc-trunk-20200316/include/c++/10.0.1/experimental/executor:581:8:
error: use of deleted function
'std::experimental::net::v1::service_already_exists::service_already_exists()'

  581 |  throw service_already_exists();

Clang diagnoses just attempting to #include the file:
https://godbolt.org/z/yH9kNp