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From: "ldionne.2 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/67041] New: [C++14] Variable template initialized by call to lambda does not compile
Date: Tue, 28 Jul 2015 05:45:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67041

            Bug ID: 67041
           Summary: [C++14] Variable template initialized by call to
                    lambda does not compile
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ldionne.2 at gmail dot com
  Target Milestone: ---

The following code does not compile on GCC trunk:

-------------------------------
template <typename ...Anything>
auto variable_template = [] { return 1; }();

int main() {
    variable_template<>;
}
-------------------------------

The error is 

---------------------------------
prog.cc: In instantiation of 'auto variable_template<>':
prog.cc:5:5:   required from here
prog.cc:2:42: error: use of 'variable_template<>' before deduction of 'auto'
 auto variable_template = [] { return 1; }();
                                          ^
prog.cc:2:42: error: use of '<lambda()> [with Anything = {}]' before deduction
of 'auto'
---------------------------------

Live example: http://melpon.org/wandbox/permlink/srH8coYkvigwJSkb

Note that Clang compiles this code fine.