Revert "parse.y: Deprecate flip-flops"
This reverts commit bae638ad5b782c44c80efe33834cb9039279af46.
[Feature #5400]
Revert "parse.y: Deprecate flip-flops"
This reverts commit bae638ad5b782c44c80efe33834cb9039279af46.
[Feature #5400]