global/local syntax errors not caught

[pyflakes-bot]

Original report by asmeurer (@asmeurer?) on Launchpad:

---

This is perhaps a bit obscure, but here's a class of syntax errors that aren't caught by pyflakes

$ cat test.py
def test(x):
    global x
$ pyflakes test.py
$ python test.py
  File "test.py", line 2
    global x
SyntaxError: name 'x' is parameter and global

I'm unsure what the full set of possible errors are here. One would need to check the Python source. I know there are some others relating to the Python 3 "nonlocal" keyword as well.

[asmeurer]

Just hit the nonlocal one. Would definitely be nice if pyflakes properly warned about these.

[asmeurer]

Another related one is nonlocal after a variable definition

$ cat test2.py
def test():
    a = 2
    nonlocal a
$ python test2.py
  File "test2.py", line 3
    nonlocal a
    ^
SyntaxError: name 'a' is assigned to before nonlocal declaration
$ pyflakes test2.py # no errors