clap_lex is what clap uses under the hood and could be used to parse trailing var args yourself.

Use .last(true) if you always want to have them after --

Use .trailing_var_arg(true) if you want the -- to be implicitly detected. Depending on your case, you might also need cmd.allow_hyphen_values(true) (arg.allow_hyphen_values(true) has some bugs so it doesn't work as well but those are fixed in the upcoming clap v4)

Ok cool, I got clap_lex sort of working. The only piece I'm trying to figure out is --foo val doesn't work, but --foo=val does. I'm assuming I need to stitch the individual args together?

Here's my PR so far: moonrepo/moon#308

clap_lex does not have sufficient knowledge to know that val is associated with --foo. In the calling code, you need to call next_os to capture val and store it with --foo.

Thanks.