error: unsupported casing: `fail`
  --> $DIR/rename_all_wrong_casing.rs:12:37
   |
12 | #[clap(name = "basic", rename_all = "fail")]
   |                                     ^^^^^^

error[E0277]: the trait bound `Opt: std::convert::From<clap::parse::matches::arg_matches::ArgMatches>` is not satisfied
  --> $DIR/rename_all_wrong_casing.rs:11:10
   |
11 | #[derive(Clap, Debug)]
   |          ^^^^ the trait `std::convert::From<clap::parse::matches::arg_matches::ArgMatches>` is not implemented for `Opt`