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1 | // Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT |
2 | // file at the top-level directory of this distribution and at | |
3 | // http://rust-lang.org/COPYRIGHT. | |
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 | ||
ea8adc8c | 11 | // revisions: ast mir |
ff7c6d11 | 12 | //[mir]compile-flags: -Z borrowck=mir |
ea8adc8c | 13 | |
1a4d82fc JJ |
14 | // Test that immutable pattern bindings cannot be reassigned. |
15 | ||
16 | enum E { | |
17 | Foo(isize) | |
18 | } | |
19 | ||
20 | struct S { | |
21 | bar: isize, | |
22 | } | |
23 | ||
24 | pub fn main() { | |
85aaf69f | 25 | match 1 { |
1a4d82fc | 26 | x => { |
abe05a73 | 27 | x += 1; //[ast]~ ERROR cannot assign twice to immutable variable `x` |
ff7c6d11 | 28 | //[mir]~^ ERROR [E0384] |
1a4d82fc JJ |
29 | } |
30 | } | |
31 | ||
32 | match E::Foo(1) { | |
33 | E::Foo(x) => { | |
abe05a73 | 34 | x += 1; //[ast]~ ERROR cannot assign twice to immutable variable `x` |
ff7c6d11 | 35 | //[mir]~^ ERROR [E0384] |
1a4d82fc JJ |
36 | } |
37 | } | |
38 | ||
39 | match (S { bar: 1 }) { | |
40 | S { bar: x } => { | |
abe05a73 | 41 | x += 1; //[ast]~ ERROR cannot assign twice to immutable variable `x` |
ff7c6d11 | 42 | //[mir]~^ ERROR [E0384] |
1a4d82fc JJ |
43 | } |
44 | } | |
45 | ||
85aaf69f | 46 | match (1,) { |
1a4d82fc | 47 | (x,) => { |
abe05a73 | 48 | x += 1; //[ast]~ ERROR cannot assign twice to immutable variable `x` |
ff7c6d11 | 49 | //[mir]~^ ERROR [E0384] |
1a4d82fc JJ |
50 | } |
51 | } | |
52 | ||
85aaf69f | 53 | match [1,2,3] { |
1a4d82fc | 54 | [x,_,_] => { |
abe05a73 | 55 | x += 1; //[ast]~ ERROR cannot assign twice to immutable variable `x` |
ff7c6d11 | 56 | //[mir]~^ ERROR [E0384] |
1a4d82fc JJ |
57 | } |
58 | } | |
59 | } |