src/test/ui/lint/dead-code/lint-dead-code-3.rs

   1 #![allow(unused_variables)]
   2 #![allow(non_camel_case_types)]
   3 #![allow(clashing_extern_declarations)]
   4 #![deny(dead_code)]
   5
   6 #![crate_type="lib"]
   7
   8
   9 pub use extern_foo as x;
  10 extern "C" {
  11     pub fn extern_foo();
  12 }
  13
  14 struct Foo; //~ ERROR: struct `Foo` is never constructed
  15 impl Foo {
  16     fn foo(&self) { //~ ERROR: associated function `foo` is never used
  17         bar()
  18     }
  19 }
  20
  21 fn bar() { //~ ERROR: function `bar` is never used
  22     fn baz() {}
  23
  24     Foo.foo();
  25     baz();
  26 }
  27
  28 // no warning
  29 struct Foo2;
  30 impl Foo2 { fn foo2(&self) { bar2() } }
  31 fn bar2() {
  32     fn baz2() {}
  33
  34     Foo2.foo2();
  35     baz2();
  36 }
  37
  38 pub fn pub_fn() {
  39     let foo2_struct = Foo2;
  40     foo2_struct.foo2();
  41
  42     blah::baz();
  43 }
  44
  45 mod blah {
  46     // not warned because it's used in the parameter of `free` and return of
  47     // `malloc` below, which are also used.
  48     enum c_void {}
  49
  50     extern "C" {
  51         fn free(p: *const c_void);
  52         fn malloc(size: usize) -> *const c_void;
  53     }
  54
  55     pub fn baz() {
  56         unsafe { free(malloc(4)); }
  57     }
  58 }
  59
  60 enum c_void {} //~ ERROR: enum `c_void` is never used
  61 extern "C" {
  62     fn free(p: *const c_void); //~ ERROR: function `free` is never used
  63 }
  64
  65 // Check provided method
  66 mod inner {
  67     pub trait Trait {
  68         fn f(&self) { f(); }
  69     }
  70
  71     impl Trait for isize {}
  72
  73     fn f() {}
  74 }
  75
  76 pub fn foo() {
  77     let a: &dyn inner::Trait = &1_isize;
  78     a.f();
  79 }