Denis Blank b17d2f9c17 Fix a GCC warning:
```cpp
  ../include/continuable/detail/expected.hpp:344:44: error: declaration of ‘using expected = class cti::detail::util::expected<cti::detail::util::detail::void_guard_tag>’ [-fpermissive]
     using expected = expected<void_guard_tag>;
                                              ^
  ../include/continuable/detail/expected.hpp:171:7: error: changes meaning of ‘expected’ from ‘class cti::detail::util::expected<cti::detail::util::detail::void_guard_tag>’ [-fpermissive]
   class expected
  ```
2018-01-24 01:44:30 +01:00
..
continuable Fix a GCC warning: 2018-01-24 01:44:30 +01:00