Rename variable crashes when there isn't a blank line is in the end of the .py file

[iddobergersf]

target file "bowler_bug.py":
def foo():
bar = 1
return bar(EOF)

code to run:
from bowler import Query
path = "bowler_bug.py"
Query(path).select_var("bar").rename("new_bar").execute(write=True, silent=True)

result:
hunks failed to apply, rejects saved to bowler_bug.py.rej
Traceback (most recent call last):
File "/Users/iddoberger/.virtualenvs/dev_research_venv/lib/python3.7/site-packages/bowler/tool.py", line 348, in apply_hunks
sh.patch(*args[1:], _in=accepted_hunks.encode("utf-8")) # type: ignore
File "/Users/iddoberger/.virtualenvs/dev_research_venv/lib/python3.7/site-packages/sh.py", line 1427, in call
return RunningCommand(cmd, call_args, stdin, stdout, stderr)
File "/Users/iddoberger/.virtualenvs/dev_research_venv/lib/python3.7/site-packages/sh.py", line 774, in init
self.wait()
File "/Users/iddoberger/.virtualenvs/dev_research_venv/lib/python3.7/site-packages/sh.py", line 792, in wait
self.handle_command_exit_code(exit_code)
File "/Users/iddoberger/.virtualenvs/dev_research_venv/lib/python3.7/site-packages/sh.py", line 815, in handle_command_exit_code
raise exc
sh.ErrorReturnCode_1:

RAN: /usr/bin/patch -u bowler_bug.py

STDOUT:
patching file bowler_bug.py
Hunk #1 FAILED at 1.
1 out of 1 hunk FAILED -- saving rejects to file bowler_bug.py.rej

STDERR:

---

When a new line is added, the renaming works

[thatch]

I will take a look, the .rej file is probably missing the "no newline at end of file" line. If so this is likely https://bugs.python.org/issue2142 which is still open.