src/tools/clippy/tests/ui/useless_attribute.rs

   1 // run-rustfix
   2 // aux-build:proc_macro_derive.rs
   3
   4 #![allow(unused)]
   5 #![warn(clippy::useless_attribute)]
   6 #![warn(unreachable_pub)]
   7 #![feature(rustc_private)]
   8
   9 #[allow(dead_code)]
  10 #[cfg_attr(feature = "cargo-clippy", allow(dead_code))]
  11 #[rustfmt::skip]
  12 #[allow(unused_imports)]
  13 #[allow(unused_extern_crates)]
  14 #[macro_use]
  15 extern crate rustc_middle;
  16
  17 #[macro_use]
  18 extern crate proc_macro_derive;
  19
  20 fn test_indented_attr() {
  21     #[allow(clippy::almost_swapped)]
  22     use std::collections::HashSet;
  23
  24     let _ = HashSet::<u32>::default();
  25 }
  26
  27 // don't lint on unused_import for `use` items
  28 #[allow(unused_imports)]
  29 use std::collections;
  30
  31 // don't lint on unused for `use` items
  32 #[allow(unused)]
  33 use std::option;
  34
  35 // don't lint on deprecated for `use` items
  36 mod foo {
  37     #[deprecated]
  38     pub struct Bar;
  39 }
  40 #[allow(deprecated)]
  41 pub use foo::Bar;
  42
  43 // This should not trigger the lint. There's lint level definitions inside the external derive
  44 // that would trigger the useless_attribute lint.
  45 #[derive(DeriveSomething)]
  46 struct Baz;
  47
  48 // don't lint on unreachable_pub for `use` items
  49 mod a {
  50     mod b {
  51         #[allow(dead_code)]
  52         #[allow(unreachable_pub)]
  53         pub struct C;
  54     }
  55
  56     #[allow(unreachable_pub)]
  57     pub use self::b::C;
  58 }
  59
  60 // don't lint on clippy::wildcard_imports for `use` items
  61 #[allow(clippy::wildcard_imports)]
  62 pub use std::io::prelude::*;
  63
  64 // don't lint on clippy::enum_glob_use for `use` items
  65 #[allow(clippy::enum_glob_use)]
  66 pub use std::cmp::Ordering::*;
  67
  68 // don't lint on clippy::redundant_pub_crate
  69 mod c {
  70     #[allow(clippy::redundant_pub_crate)]
  71     pub(crate) struct S;
  72 }
  73
  74 // https://github.com/rust-lang/rust-clippy/issues/7511
  75 pub mod split {
  76     #[allow(clippy::module_name_repetitions)]
  77     pub use regex::SplitN;
  78 }
  79
  80 // https://github.com/rust-lang/rust-clippy/issues/8768
  81 #[allow(clippy::single_component_path_imports)]
  82 use regex;
  83
  84 fn main() {
  85     test_indented_attr();
  86 }