Constant USAGE 

const USAGE: &str = "usage: xil-cleanup [-h] [--episode TAG] [--tag TAG] [--show SHOW]\n\
                     \x20                  [--parsed PATH] [--stems DIR] [--dry-run]";

argparse’s own usage block, wrapped at its default 80 columns. The three parser.error sites print this verbatim before their message, and clap’s usage rendering is not the same shape.