Error while restructuring in py3.7

[bbcVld]

While running Restructure on project which has async method which call sync method I got an error.
Example below:

import asyncio


class Gotcha:

    async def some_async_method(self):
        # do stuff
        pass
        self.some_sync_method()
        # do another stuff
        await asyncio.sleep(1)

    def some_sync_method(self):
        pass

    def next_method(self):
        pass

def pow(x, y):
    result = 1
    for i in range(y):
        result *= x
    return result

a = pow(2, 3)  # example from tutorail. Try to change to 2 ** 3

Traceback:

/home/vladislav/.virtualenvs/rope_test/lib/python3.7/site-packages/rope/refactor/patchedast.py:87: RuntimeWarning: Unknown node type <AsyncFunctionDef>; please report!
  % node.__class__.__name__, RuntimeWarning)
in file test.py
Traceback (most recent call last):
  File "/home/vladislav/.virtualenvs/rope_test/lib/python3.7/site-packages/rope/refactor/patchedast.py", line 770, in consume
    new_offset = self.source.index(token, self.offset)
ValueError: substring not found

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/vladislav/projects/rope_test/tmp38d72y", line 12, in <module>
    changes = Restructure(myproject, 'pow(${param1}, ${param2})', '${param1} ** ${param2}').get_changes()
  File "/home/vladislav/.virtualenvs/rope_test/lib/python3.7/site-packages/rope/refactor/restructure.py", line 143, in get_changes
    wildcards=self.wildcards)
  File "/home/vladislav/.virtualenvs/rope_test/lib/python3.7/site-packages/rope/refactor/similarfinder.py", line 29, in __init__
    pymodule.source_code, pymodule.get_ast(), self._does_match)
  File "/home/vladislav/.virtualenvs/rope_test/lib/python3.7/site-packages/rope/refactor/similarfinder.py", line 78, in __init__
    self._init_using_ast(node, source)
  File "/home/vladislav/.virtualenvs/rope_test/lib/python3.7/site-packages/rope/refactor/similarfinder.py", line 87, in _init_using_ast
    patchedast.patch_ast(node, source)
  File "/home/vladislav/.virtualenvs/rope_test/lib/python3.7/site-packages/rope/refactor/patchedast.py", line 41, in patch_ast
    ast.call_for_nodes(node, walker)
  File "/home/vladislav/.virtualenvs/rope_test/lib/python3.7/site-packages/rope/base/ast.py", line 63, in call_for_nodes
    result = callback(node)
  File "/home/vladislav/.virtualenvs/rope_test/lib/python3.7/site-packages/rope/refactor/patchedast.py", line 84, in __call__
    return method(node)
  File "/home/vladislav/.virtualenvs/rope_test/lib/python3.7/site-packages/rope/refactor/patchedast.py", line 574, in _Module
    self._handle(node, list(node.body), eat_spaces=True)
  File "/home/vladislav/.virtualenvs/rope_test/lib/python3.7/site-packages/rope/refactor/patchedast.py", line 112, in _handle
    ast.call_for_nodes(child, self)
  File "/home/vladislav/.virtualenvs/rope_test/lib/python3.7/site-packages/rope/base/ast.py", line 63, in call_for_nodes
    result = callback(node)
  File "/home/vladislav/.virtualenvs/rope_test/lib/python3.7/site-packages/rope/refactor/patchedast.py", line 84, in __call__
    return method(node)
  File "/home/vladislav/.virtualenvs/rope_test/lib/python3.7/site-packages/rope/refactor/patchedast.py", line 323, in _ClassDef
    self._handle(node, children)
  File "/home/vladislav/.virtualenvs/rope_test/lib/python3.7/site-packages/rope/refactor/patchedast.py", line 112, in _handle
    ast.call_for_nodes(child, self)
  File "/home/vladislav/.virtualenvs/rope_test/lib/python3.7/site-packages/rope/base/ast.py", line 63, in call_for_nodes
    result = callback(node)
  File "/home/vladislav/.virtualenvs/rope_test/lib/python3.7/site-packages/rope/refactor/patchedast.py", line 84, in __call__
    return method(node)
  File "/home/vladislav/.virtualenvs/rope_test/lib/python3.7/site-packages/rope/refactor/patchedast.py", line 438, in _FunctionDef
    self._handle(node, children)
  File "/home/vladislav/.virtualenvs/rope_test/lib/python3.7/site-packages/rope/refactor/patchedast.py", line 128, in _handle
    region = self.source.consume(child)
  File "/home/vladislav/.virtualenvs/rope_test/lib/python3.7/site-packages/rope/refactor/patchedast.py", line 778, in consume
    (token, self._get_location()))
rope.refactor.patchedast.MismatchedTokenError: Token <next_method> at (19, 3) cannot be matched

[Refactoring was finished in 0.2s with exit code 1]
[shell_cmd: /home/vladislav/.virtualenvs/rope_test/bin/python -u '/home/vladislav/projects/rope_test/tmp38d72y']
[dir: /home/vladislav/projects/rope_test]
[path: /home/vladislav/.local/bin:/usr/bin:/bin:/usr/local/bin:/usr/X11R6/bin/:/usr/games:/usr/lib/qt4/bin:/sbin:/usr/sbin:/home/vladislav/bin].

If I change function to async It will work.

versions:

 python --version
Python 3.7.6

pip show rope
Name: rope
Version: 0.18.0

I run this whith sublime plugin PyRefactor.

[bbcVld]

Check it in 0.20.1.
It works.