src/test/compile-fail/lint-dead-code-3.rs

   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.
   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 #![allow(unused_variables)]
  12 #![allow(non_camel_case_types)]
  13 #![deny(dead_code)]
  14 #![feature(libc)]
  15
  16 #![crate_type="lib"]
  17
  18 extern crate libc;
  19
  20 pub use extern_foo as x;
  21 extern {
  22     pub fn extern_foo();
  23 }
  24
  25 struct Foo; //~ ERROR: struct is never used
  26 impl Foo {
  27     fn foo(&self) { //~ ERROR: method is never used
  28         bar()
  29     }
  30 }
  31
  32 fn bar() { //~ ERROR: function is never used
  33     fn baz() {} //~ ERROR: function is never used
  34
  35     Foo.foo();
  36     baz();
  37 }
  38
  39 // no warning
  40 struct Foo2;
  41 impl Foo2 { fn foo2(&self) { bar2() } }
  42 fn bar2() {
  43     fn baz2() {}
  44
  45     Foo2.foo2();
  46     baz2();
  47 }
  48
  49 pub fn pub_fn() {
  50     let foo2_struct = Foo2;
  51     foo2_struct.foo2();
  52
  53     blah::baz();
  54 }
  55
  56 mod blah {
  57     use libc::size_t;
  58     // not warned because it's used in the parameter of `free` and return of
  59     // `malloc` below, which are also used.
  60     enum c_void {}
  61
  62     extern {
  63         fn free(p: *const c_void);
  64         fn malloc(size: size_t) -> *const c_void;
  65     }
  66
  67     pub fn baz() {
  68         unsafe { free(malloc(4)); }
  69     }
  70 }
  71
  72 enum c_void {} //~ ERROR: enum is never used
  73 extern {
  74     fn free(p: *const c_void); //~ ERROR: foreign function is never used
  75 }
  76
  77 // Check provided method
  78 mod inner {
  79     pub trait Trait {
  80         fn f(&self) { f(); }
  81     }
  82
  83     impl Trait for isize {}
  84
  85     fn f() {}
  86 }
  87
  88 pub fn foo() {
  89     let a: &inner::Trait = &1_isize;
  90     a.f();
  91 }