I confirmed that 3.9 does NOT seem to have the problem:

Python 3.9.5 (default, May 19 2021, 11:32:47) 
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> x = r'''
... "\
... "(1for c in I,\
... \ '''
>>> import ast
>>> ast.literal_eval(x)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.9/ast.py", line 62, in literal_eval
    node_or_string = parse(node_or_string, mode='eval')
  File "/usr/lib/python3.9/ast.py", line 50, in parse
    return compile(source, filename, mode, flags,
  File "<unknown>", line 3
    "\
      ^
SyntaxError: Generator expression must be parenthesized