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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/95074] Function found via ADL when it should not
Date: Tue, 12 May 2020 05:31:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95074

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
This is where we're confused by the function introduced by M::f:
                /* We do not perform argument-dependent lookup if
                   normal lookup finds a non-function, in accordance
                   with the expected resolution of DR 218.  */
                else if (!args->is_empty ()
                         && is_overloaded_fn (postfix_expression))
                  {
                    /* We only need to look at the first function,
                       because all the fns share the attribute we're
                       concerned with (all member fns or all local
                       fns).  */
                    tree fn =3D get_first_fn (postfix_expression);
                    fn =3D STRIP_TEMPLATE (fn);=20

                    /* Do not do argument dependent lookup if regular
                       lookup finds a member function or a block-scope
                       function declaration.  [basic.lookup.argdep]/3  */
                    if (!((TREE_CODE (fn) =3D=3D USING_DECL && DECL_DEPENDE=
NT_P
(fn))=20
                          || DECL_FUNCTION_MEMBER_P (fn)
                          || DECL_LOCAL_FUNCTION_P (fn)))
                      {
                        koenig_p =3D true;=20
                        if (!any_type_dependent_arguments_p (args))
                          postfix_expression
                            =3D perform_koenig_lookup (postfix_expression, =
args,=20
                                                     complain);
                      }
                  }=