tests/ui/useless_attribute.rs

   1 // run-rustfix
   2 // aux-build:proc_macro_derive.rs
   3
   4 #![warn(clippy::useless_attribute)]
   5 #![warn(unreachable_pub)]
   6 #![feature(rustc_private)]
   7
   8 #[allow(dead_code)]
   9 #[cfg_attr(feature = "cargo-clippy", allow(dead_code))]
  10 #[rustfmt::skip]
  11 #[allow(unused_imports)]
  12 #[allow(unused_extern_crates)]
  13 #[macro_use]
  14 extern crate rustc;
  15
  16 #[macro_use]
  17 extern crate proc_macro_derive;
  18
  19 // don't lint on unused_import for `use` items
  20 #[allow(unused_imports)]
  21 use std::collections;
  22
  23 // don't lint on deprecated for `use` items
  24 mod foo {
  25     #[deprecated]
  26     pub struct Bar;
  27 }
  28 #[allow(deprecated)]
  29 pub use foo::Bar;
  30
  31 // This should not trigger the lint. There's lint level definitions inside the external derive
  32 // that would trigger the useless_attribute lint.
  33 #[derive(DeriveSomething)]
  34 struct Baz;
  35
  36 // don't lint on unreachable_pub for `use` items
  37 mod a {
  38     mod b {
  39         #[allow(dead_code)]
  40         #[allow(unreachable_pub)]
  41         pub struct C {}
  42     }
  43
  44     #[allow(unreachable_pub)]
  45     pub use self::b::C;
  46 }
  47
  48 fn test_indented_attr() {
  49     #[allow(clippy::almost_swapped)]
  50     use std::collections::HashSet;
  51
  52     let _ = HashSet::<u32>::default();
  53 }
  54
  55 fn main() {
  56     test_indented_attr();
  57 }