[Bug 1955044] [NEW] /usr/include/glibmm-2.4/glibmm/variant.h:956:24: error: expected unqualified-id before ‘)’ token

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There are compilation errors when I try to include the <glibmm.h> header under C++20.
This is reproducible in Ubuntu 21.10 (Impish Indri) or Ubuntu devel (Jammy Jellyfish) but not in Ubuntu 21.04 (Impish Indri) or Debian unstable. And this is effecting building of the telegram-desktop package.

mymedia at barberry:~$ g++ -x c++ -std=gnu++20 -include glibmm.h - <<< 'int main(){}' `pkg-config --cflags --libs glibmm-2.4` -o /dev/null 
In file included from /usr/include/glibmm-2.4/glibmm/containerhandle_shared.h:23,
                 from /usr/include/glibmm-2.4/glibmm/arrayhandle.h:21,
                 from /usr/include/glibmm-2.4/glibmm.h:92,
                 from <command-line>:
/usr/include/glibmm-2.4/glibmm/variant.h:956:24: error: expected unqualified-id before ‘)’ token
  956 |   Variant<VariantBase>();
      |                        ^
/usr/include/glibmm-2.4/glibmm/variant.h:1017:25: error: expected unqualified-id before ‘)’ token
 1017 |   Variant< Variant<T> >();
      |                         ^
/usr/include/glibmm-2.4/glibmm/variant.h:1070:26: error: expected unqualified-id before ‘)’ token
 1070 |   Variant<Glib::ustring>();
      |                          ^
/usr/include/glibmm-2.4/glibmm/variant.h:1240:24: error: expected unqualified-id before ‘)’ token
 1240 |   Variant<std::string>();
      |                        ^
/usr/include/glibmm-2.4/glibmm/variant.h:1286:30: error: expected unqualified-id before ‘)’ token
 1286 |   Variant< std::pair<K, V> >()
      |                              ^
/usr/include/glibmm-2.4/glibmm/variant.h:1335:29: error: expected unqualified-id before ‘)’ token
 1335 |   Variant< std::vector<T> >()
      |                             ^
/usr/include/glibmm-2.4/glibmm/variant.h:1404:41: error: expected unqualified-id before ‘)’ token
 1404 |   Variant< std::vector<Glib::ustring> >();
      |                                         ^
/usr/include/glibmm-2.4/glibmm/variant.h:1530:39: error: expected unqualified-id before ‘)’ token
 1530 |   Variant< std::vector<std::string> >();
      |                                       ^
/usr/include/glibmm-2.4/glibmm/variant.h:1606:29: error: expected unqualified-id before ‘)’ token
 1606 |   Variant< std::map<K, V> >()
      |                             ^
/usr/include/glibmm-2.4/glibmm/variant.h:1679:33: error: expected unqualified-id before ‘)’ token
 1679 |   Variant<std::tuple<Types...>>()
      |                                 ^
In file included from /usr/include/glibmm-2.4/glibmm/variant.h:1742,
                 from /usr/include/glibmm-2.4/glibmm/containerhandle_shared.h:23,
                 from /usr/include/glibmm-2.4/glibmm/arrayhandle.h:21,
                 from /usr/include/glibmm-2.4/glibmm.h:92,
                 from <command-line>:
/usr/include/glibmm-2.4/glibmm/variant_basictypes.h:23:17: error: expected unqualified-id before ‘)’ token
   23 |   Variant<bool>()
      |                 ^
/usr/include/glibmm-2.4/glibmm/variant_basictypes.h:66:26: error: expected unqualified-id before ‘)’ token
   66 |   Variant<unsigned char>()
      |                          ^
/usr/include/glibmm-2.4/glibmm/variant_basictypes.h:109:19: error: expected unqualified-id before ‘)’ token
  109 |   Variant<gint16>()
      |                   ^
/usr/include/glibmm-2.4/glibmm/variant_basictypes.h:152:20: error: expected unqualified-id before ‘)’ token
  152 |   Variant<guint16>()
      |                    ^
/usr/include/glibmm-2.4/glibmm/variant_basictypes.h:195:19: error: expected unqualified-id before ‘)’ token
  195 |   Variant<gint32>()
      |                   ^
/usr/include/glibmm-2.4/glibmm/variant_basictypes.h:244:20: error: expected unqualified-id before ‘)’ token
  244 |   Variant<guint32>()
      |                    ^
/usr/include/glibmm-2.4/glibmm/variant_basictypes.h:287:19: error: expected unqualified-id before ‘)’ token
  287 |   Variant<gint64>()
      |                   ^
/usr/include/glibmm-2.4/glibmm/variant_basictypes.h:330:20: error: expected unqualified-id before ‘)’ token
  330 |   Variant<guint64>()
      |                    ^
/usr/include/glibmm-2.4/glibmm/variant_basictypes.h:373:19: error: expected unqualified-id before ‘)’ token
  373 |   Variant<double>()
      |                   ^
In file included from /usr/include/glibmm-2.4/glibmm/containerhandle_shared.h:23,
                 from /usr/include/glibmm-2.4/glibmm/arrayhandle.h:21,
                 from /usr/include/glibmm-2.4/glibmm.h:92,
                 from <command-line>:
/usr/include/glibmm-2.4/glibmm/variant.h:1751:1: error: no declaration matches ‘Glib::Variant<Glib::Variant<T> >::Variant()’
 1751 | Variant< Variant<T> >::Variant()
      | ^~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/glibmm-2.4/glibmm/containerhandle_shared.h:23,
                 from /usr/include/glibmm-2.4/glibmm/arrayhandle.h:21,
                 from /usr/include/glibmm-2.4/glibmm.h:92,
                 from <command-line>:
/usr/include/glibmm-2.4/glibmm/variant.h:1026:12: note: candidate is: ‘Glib::Variant<Glib::Variant<T> >::Variant(GVariant*, bool)’
 1026 |   explicit Variant< Variant<T> >(GVariant* castitem, bool take_a_reference = false);
      |            ^~~~~~~~~~~~~~~~~~~~~
/usr/include/glibmm-2.4/glibmm/variant.h:1009:7: note: ‘class Glib::Variant<Glib::Variant<T> >’ defined here
 1009 | class Variant< Variant<T> > : public VariantContainerBase
      |       ^~~~~~~~~~~~~~~~~~~~~

** Affects: glibmm2.4 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: impish jammy patch
-- 
/usr/include/glibmm-2.4/glibmm/variant.h:956:24: error: expected unqualified-id before ‘)’ token
https://bugs.launchpad.net/bugs/1955044
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