I want my program to allow multiple occurrences of a flag. The flag isn't a vector, so action = ArgAction::Append doesn't work for me, and I want the last occurrence to take priority. I haven't found any way to do this yet.

struct Args {
    /// Input files
    files: Vec<String>

    #[arg(short, long, default_value = "mystruct")]
    flag: MyStruct
}

With my current code, running my_program --flag value1 --flag value2 raises an error:

error: the argument '--flag <FLAG>' cannot be used multiple times

Usage: my_program [OPTIONS] [FILES]...

For more information, try '--help'.

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