GCC-8 introduced multiple warnings and increased the level of
strictness.

* -Wshadow will warn if a local variable shadows a typedef.
* GCC will also warn when memsetting a non-trivial type.
  In this case a non-trivial type can not have a custom constructor.
  For all intents and purposes, the class is trivially-copyable.
* GCC will also warn if you use too many paranthesses which are not
necessary