src/test/ui/lint/lint-unused-variables.rs

   1 // compile-flags: --cfg something
   2 // edition:2018
   3
   4 #![feature(async_closure)]
   5 #![deny(unused_variables)]
   6
   7 async fn foo_async(
   8     a: i32,
   9     //~^ ERROR unused variable: `a`
  10     #[allow(unused_variables)] b: i32,
  11 ) {}
  12 fn foo(
  13     #[allow(unused_variables)] a: i32,
  14     b: i32,
  15     //~^ ERROR unused variable: `b`
  16 ) {}
  17
  18 struct RefStruct {}
  19 impl RefStruct {
  20     async fn bar_async(
  21         &self,
  22         a: i32,
  23         //~^ ERROR unused variable: `a`
  24         #[allow(unused_variables)] b: i32,
  25     ) {}
  26     fn bar(
  27         &self,
  28         #[allow(unused_variables)] a: i32,
  29         b: i32,
  30         //~^ ERROR unused variable: `b`
  31     ) {}
  32     fn issue_64682_associated_fn(
  33         #[allow(unused_variables)] a: i32,
  34         b: i32,
  35         //~^ ERROR unused variable: `b`
  36     ) {}
  37 }
  38 trait RefTrait {
  39     fn bar(
  40         &self,
  41         #[allow(unused_variables)] a: i32,
  42         b: i32,
  43         //~^ ERROR unused variable: `b`
  44     ) {}
  45     fn issue_64682_associated_fn(
  46         #[allow(unused_variables)] a: i32,
  47         b: i32,
  48         //~^ ERROR unused variable: `b`
  49     ) {}
  50 }
  51 impl RefTrait for RefStruct {
  52     fn bar(
  53         &self,
  54         #[allow(unused_variables)] a: i32,
  55         b: i32,
  56         //~^ ERROR unused variable: `b`
  57     ) {}
  58     fn issue_64682_associated_fn(
  59         #[allow(unused_variables)] a: i32,
  60         b: i32,
  61         //~^ ERROR unused variable: `b`
  62     ) {}
  63 }
  64
  65 fn main() {
  66     let _: fn(_, _) = foo;
  67     let a = async move |
  68         a: i32,
  69         //~^ ERROR unused variable: `a`
  70         #[allow(unused_variables)] b: i32,
  71     | {};
  72     let b = |
  73         #[allow(unused_variables)] a: i32,
  74         b: i32,
  75         //~^ ERROR unused variable: `b`
  76     | {};
  77     let _ = a(1, 2);
  78     let _ = b(1, 2);
  79 }