src/test/compile-fail/lint-unused-imports.rs

   1 // Copyright 2012 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
  11 #![deny(unused_imports)]
  12 #![allow(dead_code)]
  13
  14 use bar::c::cc as cal;
  15
  16 use std::mem::*;            // shouldn't get errors for not using
  17                             // everything imported
  18
  19 // Should get errors for both 'Some' and 'None'
  20 use std::option::Option::{Some, None}; //~ ERROR unused import
  21                                      //~^ ERROR unused import
  22
  23 use test::A;       //~ ERROR unused import
  24 // Be sure that if we just bring some methods into scope that they're also
  25 // counted as being used.
  26 use test::B;
  27 // But only when actually used: do not get confused by the method with the same name.
  28 use test::B2; //~ ERROR unused import
  29
  30 // Make sure this import is warned about when at least one of its imported names
  31 // is unused
  32 use test2::{foo, bar}; //~ ERROR unused import
  33
  34 mod test2 {
  35     pub fn foo() {}
  36     pub fn bar() {}
  37 }
  38
  39 mod test {
  40     pub trait A { fn a(&self) {} }
  41     pub trait B { fn b(&self) {} }
  42     pub trait B2 { fn b(&self) {} }
  43     pub struct C;
  44     impl A for C {}
  45     impl B for C {}
  46 }
  47
  48 mod foo {
  49     pub struct Point{pub x: isize, pub y: isize}
  50     pub struct Square{pub p: Point, pub h: usize, pub w: usize}
  51 }
  52
  53 mod bar {
  54     // Don't ignore on 'pub use' because we're not sure if it's used or not
  55     pub use std::cmp::PartialEq;
  56     pub struct Square;
  57
  58     pub mod c {
  59         use foo::Point;
  60         use foo::Square; //~ ERROR unused import
  61         pub fn cc(_p: Point) -> super::Square {
  62             fn f() -> super::Square {
  63                 super::Square
  64             }
  65             f()
  66         }
  67     }
  68
  69     #[allow(unused_imports)]
  70     mod foo {
  71         use std::cmp::PartialEq;
  72     }
  73 }
  74
  75 fn g() {
  76     use self::g; //~ ERROR unused import
  77     fn f() {
  78         self::g();
  79     }
  80 }
  81
  82 // c.f. issue #35135
  83 #[allow(unused_variables)]
  84 fn h() {
  85     use test2::foo; //~ ERROR unused import
  86     let foo = 0;
  87 }
  88
  89 fn main() {
  90     cal(foo::Point{x:3, y:9});
  91     let mut a = 3;
  92     let mut b = 4;
  93     swap(&mut a, &mut b);
  94     test::C.b();
  95     let _a = foo();
  96 }