Running with Python 3.5.1 on OS X, I get:
$ python3 runtests.py
running mypy --python-version 3.5 # with 243 files
running mypy --python-version 3.4 # with 243 files
running mypy --python-version 3.3 # with 229 files
running mypy --python-version 3.2 # with 228 files
running mypy --python-version 2.7 # with 330 files
third_party/2.7/sqlalchemy/sql/base.pyi:4: note: In module imported here,
third_party/2.7/sqlalchemy/engine/strategies.pyi:6: note: ... from here:
third_party/2.7/tornado/util.pyi:1: error: Duplicate module named '.util'
--- exit status 1 ---