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1 // Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution.
3 //
4 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
5 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
7 // option. This file may not be copied, modified, or distributed
8 // except according to those terms.
9
10 #![warn(clippy::expect_fun_call)]
11 #![allow(clippy::useless_format)]
12
13 /// Checks implementation of the `EXPECT_FUN_CALL` lint
14
15 fn expect_fun_call() {
16     struct Foo;
17
18     impl Foo {
19         fn new() -> Self { Foo }
20
21         fn expect(&self, msg: &str) {
22             panic!("{}", msg)
23         }
24     }
25
26     let with_some = Some("value");
27     with_some.expect("error");
28
29     let with_none: Option<i32> = None;
30     with_none.expect("error");
31
32     let error_code = 123_i32;
33     let with_none_and_format: Option<i32> = None;
34     with_none_and_format.expect(&format!("Error {}: fake error", error_code));
35
36     let with_none_and_as_str: Option<i32> = None;
37     with_none_and_as_str.expect(format!("Error {}: fake error", error_code).as_str());
38
39     let with_ok: Result<(), ()> = Ok(());
40     with_ok.expect("error");
41
42     let with_err: Result<(), ()> = Err(());
43     with_err.expect("error");
44
45     let error_code = 123_i32;
46     let with_err_and_format: Result<(), ()> = Err(());
47     with_err_and_format.expect(&format!("Error {}: fake error", error_code));
48
49     let with_err_and_as_str: Result<(), ()> = Err(());
50     with_err_and_as_str.expect(format!("Error {}: fake error", error_code).as_str());
51
52     let with_dummy_type = Foo::new();
53     with_dummy_type.expect("another test string");
54
55     let with_dummy_type_and_format = Foo::new();
56     with_dummy_type_and_format.expect(&format!("Error {}: fake error", error_code));
57
58     let with_dummy_type_and_as_str = Foo::new();
59     with_dummy_type_and_as_str.expect(format!("Error {}: fake error", error_code).as_str());
60
61     //Issue #2979 - this should not lint
62     let msg = "bar";
63     Some("foo").expect(msg);
64
65     Some("foo").expect({ &format!("error") });
66     Some("foo").expect(format!("error").as_ref());
67 }
68
69 fn main() {}