src/test/compile-fail/lint-dead-code-1.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 #![no_std]
  12 #![allow(unused_variables)]
  13 #![allow(non_camel_case_types)]
  14 #![allow(non_upper_case_globals)]
  15 #![deny(dead_code)]
  16
  17 #![crate_type="lib"]
  18
  19 pub use foo2::Bar2;
  20
  21 mod foo {
  22     pub struct Bar; //~ ERROR: struct is never used
  23 }
  24
  25 mod foo2 {
  26     pub struct Bar2;
  27 }
  28
  29 pub static pub_static: isize = 0;
  30 static priv_static: isize = 0; //~ ERROR: static item is never used
  31 const used_static: isize = 0;
  32 pub static used_static2: isize = used_static;
  33 const USED_STATIC: isize = 0;
  34 const STATIC_USED_IN_ENUM_DISCRIMINANT: isize = 10;
  35
  36 pub const pub_const: isize = 0;
  37 const priv_const: isize = 0; //~ ERROR: constant item is never used
  38 const used_const: isize = 0;
  39 pub const used_const2: isize = used_const;
  40 const USED_CONST: isize = 1;
  41 const CONST_USED_IN_ENUM_DISCRIMINANT: isize = 11;
  42
  43 pub type typ = *const UsedStruct4;
  44 pub struct PubStruct;
  45 struct PrivStruct; //~ ERROR: struct is never used
  46 struct UsedStruct1 {
  47     #[allow(dead_code)]
  48     x: isize
  49 }
  50 struct UsedStruct2(isize);
  51 struct UsedStruct3;
  52 pub struct UsedStruct4;
  53 // this struct is never used directly, but its method is, so we don't want
  54 // to warn it
  55 struct SemiUsedStruct;
  56 impl SemiUsedStruct {
  57     fn la_la_la() {}
  58 }
  59 struct StructUsedAsField;
  60 pub struct StructUsedInEnum;
  61 struct StructUsedInGeneric;
  62 pub struct PubStruct2 {
  63     #[allow(dead_code)]
  64     struct_used_as_field: *const StructUsedAsField
  65 }
  66
  67 pub enum pub_enum { foo1, bar1 }
  68 pub enum pub_enum2 { a(*const StructUsedInEnum) }
  69 pub enum pub_enum3 {
  70     Foo = STATIC_USED_IN_ENUM_DISCRIMINANT,
  71     Bar = CONST_USED_IN_ENUM_DISCRIMINANT,
  72 }
  73
  74 enum priv_enum { foo2, bar2 } //~ ERROR: enum is never used
  75 enum used_enum {
  76     foo3,
  77     bar3 //~ ERROR variant is never used
  78 }
  79
  80 fn f<T>() {}
  81
  82 pub fn pub_fn() {
  83     used_fn();
  84     let used_struct1 = UsedStruct1 { x: 1 };
  85     let used_struct2 = UsedStruct2(1);
  86     let used_struct3 = UsedStruct3;
  87     let e = used_enum::foo3;
  88     SemiUsedStruct::la_la_la();
  89
  90     let i = 1;
  91     match i {
  92         USED_STATIC => (),
  93         USED_CONST => (),
  94         _ => ()
  95     }
  96     f::<StructUsedInGeneric>();
  97 }
  98 fn priv_fn() { //~ ERROR: function is never used
  99     let unused_struct = PrivStruct;
 100 }
 101 fn used_fn() {}
 102
 103 fn foo() { //~ ERROR: function is never used
 104     bar();
 105     let unused_enum = priv_enum::foo2;
 106 }
 107
 108 fn bar() { //~ ERROR: function is never used
 109     foo();
 110 }
 111
 112 // Code with #[allow(dead_code)] should be marked live (and thus anything it
 113 // calls is marked live)
 114 #[allow(dead_code)]
 115 fn g() { h(); }
 116 fn h() {}