[Bug c++/86942] A trailing-return-type is allowed when the return type is not 'auto' for using declarations

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86942

--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Fri Aug 24 15:48:43 2018
New Revision: 263836

URL: https://gcc.gnu.org/viewcvs?rev=263836&root=gcc&view=rev
Log:
        PR c++/67012
        PR c++/86942
        * decl.c (grokdeclarator): Disallow functions with trailing return
        type with decltype(auto) as its type.  Also check the function if
        it's inner declarator doesn't exist

        * g++.dg/cpp0x/auto52.C: New test.
        * g++.dg/cpp1y/auto-fn52.C: New test.
        * g++.dg/cpp1y/auto-fn53.C: New test.
        * g++.dg/cpp1y/auto-fn54.C: New test.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/auto52.C
    trunk/gcc/testsuite/g++.dg/cpp1y/auto-fn52.C
    trunk/gcc/testsuite/g++.dg/cpp1y/auto-fn53.C
    trunk/gcc/testsuite/g++.dg/cpp1y/auto-fn54.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/decl.c
    trunk/gcc/testsuite/ChangeLog