pytype: import typing directly
First we no longer needs the pycompat layer, second having the types imported in
all case will allow to use them more directly in type annotation, something
important to upgrade the old "type comment" to proper type annotation.
A lot a stupid assert are needed to keep pyflakes happy. We should be able to
remove most of them once the type comment have been upgraded.
#require docutils gettext
$ $TESTDIR/check-gendoc da
checking for parse errors