Some unicode input may cause print_help and print_long_help panic(found by afl.rs)

[StevenJiang1110]

Code

extern crate clap;
fn main() {
    let param0 = "00000000000000-00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 璀璀璀";
    let mut app_ = clap::SubCommand::with_name(param0);
    let _ = clap::App::print_long_help(&mut app_);
}

or

extern crate clap;
fn main() {
    let app_ = clap::SubCommand::with_name("0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000-қ00000000000000000 蚝");
    let mut app2_ = clap::App::display_order(app_ ,3472328296227680304);
    let _ = clap::App::print_help(&mut app2_);
}

Steps to reproduce the issue

1. Run cargo run
   The bug report is as follows.
   

Version

• Rust: rustc 1.46.0-dev
• Clap: 2.33.3

[dependencies]
clap = { version = "2.33.3" }

I also put reproduce files at print_help
and print_long_help
I hope you can check if this is a bug. Thanks a lot.

[pksunkara]

Please try with master.

[StevenJiang1110]

I tried and it seems the master has removed the subCommand.

[ldm0]

@StevenJiang1110 The Subcommand is integrated with App now, and the corresponding codes are:

fn main() {
    let param0 = "00000000000000-00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 璀璀璀";
    let mut app_ = clap::App::new(param0);
    let _ = clap::App::print_long_help(&mut app_);
}

and:

fn main() {
    let app_ = clap::App::new("0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000-қ00000000000000000 蚝");
    let mut app2_ = clap::App::display_order(app_ ,3472328296227680304);
    let _ = clap::App::print_help(&mut app2_);
}

Both work fine.