@"reio"#p9998 Thanks,
the problem is that method setRules() and setFinder() return ConfigInterface (not static),
and ConfigInterface does not define method setParallelConfig().
It's simply an inaccuracy in php-cs-fixer source code - those methods should be annotated returning static, not self.
I'll take a look at this case, we can probably be smarter and infer the correct information by ourselves.
