/in/foo.cc: In function 'int main()':
/in/foo.cc:12:9: warning: lambda capture initializers only available with '-std=c++14' or '-std=gnu++14' [-Wc++14-extensions]
   12 |     [&, i = 0]() mutable {
      |         ^
/in/foo.cc: In lambda function:
/in/foo.cc:16:13: error: 'operator()' not defined
   16 |             operator()();
      |             ^~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:23:9: warning: lambda capture initializers only available with '-std=c++14' or '-std=gnu++14' [-Wc++14-extensions]
   23 |     [&, i = 0]() mutable {
      |         ^
/in/foo.cc: In lambda function:
/in/foo.cc:31:13: error: 'operator()' not defined
   31 |             operator()();
      |             ^~~~~~~~~~