Remove clippy_lints from useless attribute test

Author: Manishearth

tests/ui/auxiliary/proc_macro_derive.rs

@@ -16,7 +16,7 @@ pub fn derive(_: TokenStream) -> TokenStream {
     let output = quote! {
         // Should not trigger `useless_attribute`
         #[allow(dead_code)]
-        extern crate clippy_lints;
+        extern crate rustc;
     };
     output
 }

tests/ui/useless_attribute.rs

@@ -2,16 +2,15 @@
 
 #![warn(clippy::useless_attribute)]
 #![warn(unreachable_pub)]
+#![feature(rustc_private)]
 
 #[allow(dead_code)]
 #[cfg_attr(feature = "cargo-clippy", allow(dead_code))]
 #[rustfmt::skip]
-#[cfg_attr(feature = "cargo-clippy",
-           allow(dead_code))]
 #[allow(unused_imports)]
 #[allow(unused_extern_crates)]
 #[macro_use]
-extern crate clippy_lints;
+extern crate rustc;
 
 #[macro_use]
 extern crate proc_macro_derive;

tests/ui/useless_attribute.stderr

@@ -1,13 +1,13 @@
 error: useless lint attribute
-  --> $DIR/useless_attribute.rs:6:1
+  --> $DIR/useless_attribute.rs:7:1
    |
 LL | #[allow(dead_code)]
    | ^^^^^^^^^^^^^^^^^^^ help: if you just forgot a `!`, use: `#![allow(dead_code)]`
    |
    = note: `-D clippy::useless-attribute` implied by `-D warnings`
 
 error: useless lint attribute
-  --> $DIR/useless_attribute.rs:7:1
+  --> $DIR/useless_attribute.rs:8:1
    |
 LL | #[cfg_attr(feature = "cargo-clippy", allow(dead_code))]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: if you just forgot a `!`, use: `#![cfg_attr(feature = "cargo-clippy", allow(dead_code)`