1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
fn macros() {
macro_rules! foo{
($p:pat, $e:expr, $b:block) => {{
if let $p = $e $b
}}
}
macro_rules! bar{
($p:pat, $e:expr, $b:block) => {{
foo!($p, $e, $b)
}}
}
foo!(a, 1, { //~ ERROR irrefutable if-let
println!("irrefutable pattern");
});
bar!(a, 1, { //~ ERROR irrefutable if-let
println!("irrefutable pattern");
});
}
pub fn main() {
if let a = 1 { //~ ERROR irrefutable if-let
println!("irrefutable pattern");
}
if let a = 1 { //~ ERROR irrefutable if-let
println!("irrefutable pattern");
} else if true {
println!("else-if in irrefutable if-let");
} else {
println!("else in irrefutable if-let");
}
if let 1 = 2 {
println!("refutable pattern");
} else if let a = 1 { //~ ERROR irrefutable if-let
println!("irrefutable pattern");
}
if true {
println!("if");
} else if let a = 1 { //~ ERROR irrefutable if-let
println!("irrefutable pattern");
}
}
|
