# NOTE: We had several choices for the annotation to use for type arg:
# 1) Type[_T]
#   - Pros: works in PyCharm without plugin support
#   - Cons: produces less informative error in the case of conflicting TypeVars
#     e.g. `attr.ib(default='bad', type=int)`
# 2) Callable[..., _T]
#   - Pros: more informative errors than #1
#   - Cons: validator tests results in confusing error.
#     e.g. `attr.ib(type=int, validator=validate_str)`
# 3) type (and do all of the work in the mypy plugin)
#   - Pros: in mypy, the behavior of type argument is exactly the same as with
#     annotations.
#   - Cons: completely disables type inspections in PyCharm when using the
#     type arg.
# We chose option #1 until either PyCharm adds support for attrs, or python 2
# reaches EOL.