1// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>,
2// Kevin Knapp (@kbknapp) <kbknapp@gmail.com>, and
3// Ana Hobden (@hoverbear) <operator@hoverbear.org>
4//
5// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8// option. This file may not be copied, modified, or distributed
9// except according to those terms.
10//
11// This work was derived from Structopt (https://github.com/TeXitoi/structopt)
12// commit#ea76fa1b1b273e65e3b0b1046643715b49bec51f which is licensed under the
13// MIT/Apache 2.0 license.
14
15#![deny(warnings)]
16
17use clap::Parser;
18
19fn try_str(s: &str) -> Result<String, std::convert::Infallible> {
20    Ok(s.into())
21}
22
23#[test]
24fn warning_never_struct() {
25    #[derive(Parser, Debug, PartialEq)]
26    struct Opt {
27        #[arg(value_parser = try_str, default_value_t)]
28        s: String,
29    }
30    assert_eq!(
31        Opt {
32            s: "foo".to_string()
33        },
34        Opt::try_parse_from(["test", "foo"]).unwrap()
35    );
36}
37
38#[test]
39fn warning_never_enum() {
40    #[derive(Parser, Debug, PartialEq)]
41    enum Opt {
42        Foo {
43            #[arg(value_parser = try_str, default_value_t)]
44            s: String,
45        },
46    }
47    assert_eq!(
48        Opt::Foo {
49            s: "foo".to_string()
50        },
51        Opt::try_parse_from(["test", "foo", "foo"]).unwrap()
52    );
53}
54