src/test/compile-fail/lint-dead-code-4.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
  15 struct Foo {
  16     x: usize,
  17     b: bool, //~ ERROR: field is never used
  18 }
  19
  20 fn field_read(f: Foo) -> usize {
  21     f.x.pow(2)
  22 }
  23
  24 enum XYZ {
  25     X, //~ ERROR variant is never used
  26     Y { //~ ERROR variant is never used
  27         a: String,
  28         b: i32,
  29         c: i32,
  30     },
  31     Z
  32 }
  33
  34 enum ABC { //~ ERROR enum is never used
  35     A,
  36     B {
  37         a: String,
  38         b: i32,
  39         c: i32,
  40     },
  41     C
  42 }
  43
  44 // ensure struct variants get warning for their fields
  45 enum IJK {
  46     I, //~ ERROR variant is never used
  47     J {
  48         a: String,
  49         b: i32, //~ ERROR field is never used
  50         c: i32, //~ ERROR field is never used
  51     },
  52     K //~ ERROR variant is never used
  53
  54 }
  55
  56 fn struct_variant_partial_use(b: IJK) -> String {
  57     match b {
  58         IJK::J { a, b: _, .. } => a,
  59         _ => "".to_string()
  60     }
  61 }
  62
  63 fn field_match_in_patterns(b: XYZ) -> String {
  64     match b {
  65         XYZ::Y { a, b: _, .. } => a,
  66         _ => "".to_string()
  67     }
  68 }
  69
  70 struct Bar {
  71     x: usize, //~ ERROR: field is never used
  72     b: bool,
  73     c: bool, //~ ERROR: field is never used
  74     _guard: ()
  75 }
  76
  77 #[repr(C)]
  78 struct Baz {
  79     x: u32,
  80 }
  81
  82 fn field_match_in_let(f: Bar) -> bool {
  83     let Bar { b, c: _, .. } = f;
  84     b
  85 }
  86
  87 fn main() {
  88     field_read(Foo { x: 1, b: false });
  89     field_match_in_patterns(XYZ::Z);
  90     struct_variant_partial_use(IJK::J { a: "".into(), b: 1, c: -1 });
  91     field_match_in_let(Bar { x: 42, b: true, c: false, _guard: () });
  92     let _ = Baz { x: 0 };
  93 }