Exclusive can not be used with required

[FineFindus]

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Rust Version

rustc 1.58.1 (db9d1b20b 2022-01-20)

Clap Version

3.1.6

Minimal reproducible code

use clap::{Arg, Command};

fn main() {
    Command::new("bug")
        .arg(
            Arg::new("test")
                .long("test")
                .exclusive(true)
        )
        .arg(Arg::new("input").takes_value(true).required(true))
        .get_matches();
}

Steps to reproduce the bug with the above code

cargo run -- --test

Actual Behaviour

According to the documentation of required(), it should be overridden by conflicting rules. This should include exclusive, since it states that it conflicts with all other arguments.

Expected Behaviour

When not specifying the input argument the following error occurs:

error: The following required arguments were not provided:
    <input>

USAGE:
    bug --test <input>

For more information try --help

When specifying the required argument

cargo run -- required --test

the program will still throw an error because the exclusive argument is not exlusive.

error: The argument '--test' cannot be used with one or more of the other specified arguments

USAGE:
    bug [OPTIONS] <input>

For more information try --help

Additional Context

No response

Debug Output

Finished dev [unoptimized + debuginfo] target(s) in 0.06s
 Running `target/debug/bug --test`

[ clap::build::command] App::_do_parse
[ clap::build::command] App::_build
[ clap::build::command] App::_propagate:bug
[ clap::build::command] App::_check_help_and_version: bug
[ clap::build::command] App::_check_help_and_version: Removing generated version
[ clap::build::command] App::_propagate_global_args:bug
[ clap::build::command] App::_derive_display_order:bug
[ clap::build::debug_asserts] Command::_debug_asserts
[ clap::build::debug_asserts] Arg::_debug_asserts:help
[ clap::build::debug_asserts] Arg::_debug_asserts:test
[ clap::build::debug_asserts] Arg::_debug_asserts:input
[ clap::build::debug_asserts] Command::_verify_positionals
[ clap::parse::parser] Parser::get_matches_with
[ clap::parse::parser] Parser::get_matches_with: Begin parsing 'RawOsStr("--test")' ([45, 45, 116, 101, 115, 116])
[ clap::parse::parser] Parser::get_matches_with: Positional counter...1
[ clap::parse::parser] Parser::get_matches_with: Low index multiples...false
[ clap::parse::parser] Parser::possible_subcommand: arg=RawOsStr("--test")
[ clap::parse::parser] Parser::get_matches_with: sc=None
[ clap::parse::parser] Parser::parse_long_arg
[ clap::parse::parser] Parser::parse_long_arg: cur_idx:=1
[ clap::parse::parser] Parser::parse_long_arg: Does it contain '='...
[ clap::parse::parser] No
[ clap::parse::parser] Parser::parse_long_arg: Found valid opt or flag '--test'
[ clap::parse::parser] Parser::check_for_help_and_version_str
[ clap::parse::parser] Parser::check_for_help_and_version_str: Checking if --RawOsStr("test") is help or version...
[ clap::parse::parser] Neither
[ clap::parse::parser] Parser::parse_long_arg: Presence validated
[ clap::parse::parser] Parser::parse_flag
[ clap::parse::parser] Parser::remove_overrides: id=test
[ clap::parse::arg_matcher] ArgMatcher::inc_occurrence_of_arg: id=test
[ clap::build::command] App::groups_for_arg: id=test
[ clap::parse::parser] Parser::get_matches_with: After parse_long_arg ValuesDone
[ clap::parse::validator] Validator::validate
[ clap::parse::parser] Parser::add_defaults
[ clap::parse::parser] Parser::add_defaults:iter:input:
[ clap::parse::parser] Parser::add_value: doesn't have conditional defaults
[ clap::parse::parser] Parser::add_value:iter:input: doesn't have default vals
[ clap::parse::parser] Parser::add_value:iter:input: doesn't have default missing vals
[ clap::parse::validator] Validator::validate_conflicts
[ clap::parse::validator] Validator::validate_exclusive
[ clap::parse::validator] Validator::validate_exclusive:iter:test
[ clap::parse::validator] Validator::validate_conflicts::iter: id=test
[ clap::parse::validator] Conflicts::gather_conflicts
[ clap::parse::validator] Validator::validate_required: required=ChildGraph([Child { id: input, children: [] }])
[ clap::parse::validator] Validator::gather_requires
[ clap::parse::validator] Validator::gather_requires:iter:test
[ clap::parse::validator] Validator::validate_required:iter:aog=input
[ clap::parse::validator] Validator::validate_required:iter: This is an arg
[ clap::parse::validator] Validator::is_missing_required_ok: input
[ clap::parse::validator] Validator::validate_arg_conflicts: a="input"
[ clap::parse::validator] Validator::missing_required_error; incl=[]
[ clap::parse::validator] Validator::missing_required_error: reqs=ChildGraph([Child { id: input, children: [] }])
[ clap::output::usage] Usage::get_required_usage_from: incls=[], matcher=true, incl_last=true
[ clap::output::usage] Usage::get_required_usage_from: unrolled_reqs={input}
[ clap::output::usage] Usage::get_required_usage_from:iter:input
[ clap::output::usage] Usage::get_required_usage_from: ret_val=[""]
[ clap::parse::validator] Validator::missing_required_error: req_args=[
"",
]
[ clap::output::usage] Usage::create_usage_with_title
[ clap::output::usage] Usage::create_usage_no_title
[ clap::output::usage] Usage::create_smart_usage
[ clap::output::usage] Usage::get_required_usage_from: incls=[test], matcher=false, incl_last=true
[ clap::output::usage] Usage::get_required_usage_from: unrolled_reqs={input}
[ clap::output::usage] Usage::get_required_usage_from:iter:test
[ clap::output::usage] Usage::get_required_usage_from:iter:input
[ clap::output::usage] Usage::get_required_usage_from: ret_val=["--test", ""]
[ clap::build::command] App::color: Color setting...
[ clap::build::command] Auto
error: The following required arguments were not provided:

USAGE:
bug --test

For more information try --help

[epage]

Thanks for reporting this! You are correct that exclusive is a form of a conflict and conflicts should override required.