1 // Copyright 2013 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.
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.
11 // Exercise the unused_mut attribute in some positive and negative cases
13 #![allow(dead_assignment)]
14 #![allow(unused_variable)]
16 #![allow(deprecated_owned_vector)]
22 let mut a = 3; //~ ERROR: variable does not need to be mutable
23 let mut a = 2; //~ ERROR: variable does not need to be mutable
24 let mut b = 3; //~ ERROR: variable does not need to be mutable
25 let mut a = vec!(3); //~ ERROR: variable does not need to be mutable
26 let (mut a, b) = (1, 2); //~ ERROR: variable does not need to be mutable
29 mut x => {} //~ ERROR: variable does not need to be mutable
32 let x = |mut y: int| 10; //~ ERROR: variable does not need to be mutable
33 fn what(mut foo: int) {} //~ ERROR: variable does not need to be mutable
38 let mut a = Vec::new();
40 let mut a = Vec::new();
44 let (mut a, b) = (1, 2);
53 let x = |mut y: int| y = 32;
54 fn nothing(mut foo: int) { foo = 37; }
56 // leading underscore should avoid the warning, just like the
57 // unused variable lint.
63 // make sure the lint attribute can be turned off