Commit d8fa8df052 added support for parsing and formatting PEP572, but it missed the posibility to add PEP572 syntax in while statements.
d8fa8df052
* Parse `:=` properly * never unwrap parenthesis around `:=` * When checking for AST-equivalence, use `ast` instead of `typed-ast` when running on python >=3.8 * Assume code that uses `:=` is at least 3.8