[Bug c/67377] gcc 6.0 fails to compile on Darwin 14

["juergen.reuter at desy dot de" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67377

--- Comment #1 from Jürgen Reuter <juergen.reuter at desy dot de> ---
First remark from my side: the error with the missing /usr/install came from an
incompletely installed MAC OS X command line tools, sorry for the digression.
>From gcc-bugs-return-495766-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 27 23:19:49 2015
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From: "ldionne.2 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/66135] trailing return type error for generic lambda
Date: Thu, 27 Aug 2015 23:19:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf135

Louis Dionne <ldionne.2 at gmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |ldionne.2 at gmail dot com

--- Comment #2 from Louis Dionne <ldionne.2 at gmail dot com> ---
Another test case:

    template <typename T>
    void f(T) {
        [](auto& x) -> decltype(x.foo()) { };
    }

    template void f(int);

And a variation, which also yields an invalid "x has incomplete type" error:

    template <typename T>
    void f(T) {
        [](auto x) -> decltype(x.foo()) { };
    }

    template void f(int);