New submission from Dylan Lloyd :
```
#!/usr/bin/env python
# -*- coding: utf-8 -*-
regex_format = rf''
```
```
yapf poc.py
```
```
Traceback (most recent call last):
File "lib/python3.6/site-packages/yapf/yapflib/pytree_utils.py", line 115, in
ParseCodeToTree
tree = parser_driver.parse_string(code, debug=False)
File "lib/python3.6/lib2to3/pgen2/driver.py", line 107, in parse_string
return self.parse_tokens(tokens, debug)
File "lib/python3.6/lib2to3/pgen2/driver.py", line 72, in parse_tokens
if p.addtoken(type, value, (prefix, start)):
File "lib/python3.6/lib2to3/pgen2/parse.py", line 159, in addtoken
raise ParseError("bad input", type, value, context)
lib2to3.pgen2.parse.ParseError: bad input: type=3, value="''", context=('', (4,
17))
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "bin/yapf", line 10, in
sys.exit(run_main())
File "lib/python3.6/site-packages/yapf/__init__.py", line 326, in run_main
sys.exit(main(sys.argv))
File "lib/python3.6/site-packages/yapf/__init__.py", line 213, in main
verbose=args.verbose)
File "lib/python3.6/site-packages/yapf/__init__.py", line 263, in FormatFiles
in_place, print_diff, verify, verbose)
File "lib/python3.6/site-packages/yapf/__init__.py", line 289, in _FormatFile
logger=logging.warning)
File "lib/python3.6/site-packages/yapf/yapflib/yapf_api.py", line 91, in
FormatFile
verify=verify)
File "lib/python3.6/site-packages/yapf/yapflib/yapf_api.py", line 129, in
FormatCode
tree = pytree_utils.ParseCodeToTree(unformatted_source)
File "lib/python3.6/site-packages/yapf/yapflib/pytree_utils.py", line 121, in
ParseCodeToTree
tree = parser_driver.parse_string(code, debug=False)
File "lib/python3.6/lib2to3/pgen2/driver.py", line 107, in parse_string
return self.parse_tokens(tokens, debug)
File "lib/python3.6/lib2to3/pgen2/driver.py", line 72, in parse_tokens
if p.addtoken(type, value, (prefix, start)):
File "lib/python3.6/lib2to3/pgen2/parse.py", line 159, in addtoken
raise ParseError("bad input", type, value, context)
lib2to3.pgen2.parse.ParseError: bad input: type=3, value="''", context=('', (4,
17))
```
--
components: 2to3 (2.x to 3.x conversion tool)
messages: 335238
nosy: majuscule
priority: normal
severity: normal
status: open
title: lib2to3 cannot parse rf''
type: crash
versions: Python 3.6
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<https://bugs.python.org/issue35968>
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