def parse_function_type_comment(type_comment: str) -> Optional[FunctionType]:
if _ast_py3 is None:<EOL><INDENT>return None<EOL><DEDENT>func_type = _ast_py3.parse(type_comment, "<STR_LIT>", "<STR_LIT>")<EOL>return FunctionType(argtypes=func_type.argtypes, returns=func_type.returns)<EOL>
Given a correct type comment, obtain a FunctionType object