Parsing failure propagation from ("." 1*BIT) to 1*("." 1*BIT).
Theorem: fail-1*-dot-1*bit-when-fail-dot-1*bit
(defthm fail-1*-dot-1*bit-when-fail-dot-1*bit (implies (mv-nth 0 (parse-dot-1*bit input)) (mv-nth 0 (parse-1*-dot-1*bit input))))