diff --git a/library/core/src/slice/mod.rs b/library/core/src/slice/mod.rs
index 0d635aced85bf..a19fcf93c4d90 100644
--- a/library/core/src/slice/mod.rs
+++ b/library/core/src/slice/mod.rs
@@ -3410,7 +3410,7 @@ impl<T> [T] {
     /// assert_eq!(a, ['e', 'f', 'a', 'b', 'c', 'd']);
     /// ```
     ///
-    /// Rotate a subslice:
+    /// Rotating a subslice:
     ///
     /// ```
     /// let mut a = ['a', 'b', 'c', 'd', 'e', 'f'];
diff --git a/tests/rustdoc/issue-15169.rs b/tests/rustdoc/anchor-id-trait-method-15169.rs
similarity index 56%
rename from tests/rustdoc/issue-15169.rs
rename to tests/rustdoc/anchor-id-trait-method-15169.rs
index e525d85e21ec0..26bb59c1875fd 100644
--- a/tests/rustdoc/issue-15169.rs
+++ b/tests/rustdoc/anchor-id-trait-method-15169.rs
@@ -1,3 +1,7 @@
 // @has issue_15169/struct.Foo.html '//*[@id="method.eq"]' 'fn eq'
+
+// https://github.com/rust-lang/rust/issues/15169
+#![crate_name="issue_15169"]
+
 #[derive(PartialEq)]
 pub struct Foo;
diff --git a/tests/rustdoc/issue-20646.rs b/tests/rustdoc/assoc-type-bindings-20646.rs
similarity index 90%
rename from tests/rustdoc/issue-20646.rs
rename to tests/rustdoc/assoc-type-bindings-20646.rs
index b2ee9c26014b3..375b5b5b23ea5 100644
--- a/tests/rustdoc/issue-20646.rs
+++ b/tests/rustdoc/assoc-type-bindings-20646.rs
@@ -1,6 +1,8 @@
 // aux-build:issue-20646.rs
 // ignore-cross-compile
 
+// https://github.com/rust-lang/rust/issues/20646
+#![crate_name="issue_20646"]
 #![feature(associated_types)]
 
 extern crate issue_20646;
diff --git a/tests/rustdoc/issue-19190-2.rs b/tests/rustdoc/deref-methods-19190-foreign-type.rs
similarity index 77%
rename from tests/rustdoc/issue-19190-2.rs
rename to tests/rustdoc/deref-methods-19190-foreign-type.rs
index b6416e2e5b97e..c8326992115c7 100644
--- a/tests/rustdoc/issue-19190-2.rs
+++ b/tests/rustdoc/deref-methods-19190-foreign-type.rs
@@ -1,3 +1,7 @@
+// https://github.com/rust-lang/rust/issues/19190
+
+#![crate_name="issue_19190_2"]
+
 use std::ops::Deref;
 
 pub struct Bar;
diff --git a/tests/rustdoc/issue-19190-3.rs b/tests/rustdoc/deref-methods-19190-inline.rs
similarity index 90%
rename from tests/rustdoc/issue-19190-3.rs
rename to tests/rustdoc/deref-methods-19190-inline.rs
index 4d34ce6509fe3..619b268d68b39 100644
--- a/tests/rustdoc/issue-19190-3.rs
+++ b/tests/rustdoc/deref-methods-19190-inline.rs
@@ -1,6 +1,9 @@
 // aux-build:issue-19190-3.rs
 // ignore-cross-compile
 
+// https://github.com/rust-lang/rust/issues/19190
+#![crate_name="issue_19190_3"]
+
 extern crate issue_19190_3;
 
 use std::ops::Deref;
diff --git a/tests/rustdoc/issue-19190.rs b/tests/rustdoc/deref-methods-19190.rs
similarity index 86%
rename from tests/rustdoc/issue-19190.rs
rename to tests/rustdoc/deref-methods-19190.rs
index 2046273e2c1ba..4c274d82ff785 100644
--- a/tests/rustdoc/issue-19190.rs
+++ b/tests/rustdoc/deref-methods-19190.rs
@@ -1,3 +1,6 @@
+// https://github.com/rust-lang/rust/issues/19190
+#![crate_name="issue_19190"]
+
 use std::ops::Deref;
 
 pub struct Foo;
diff --git a/tests/rustdoc/issue-13698.rs b/tests/rustdoc/doc-hidden-method-13698.rs
similarity index 81%
rename from tests/rustdoc/issue-13698.rs
rename to tests/rustdoc/doc-hidden-method-13698.rs
index 3046a8a28627d..f1bd6e73babdd 100644
--- a/tests/rustdoc/issue-13698.rs
+++ b/tests/rustdoc/doc-hidden-method-13698.rs
@@ -1,6 +1,9 @@
 // aux-build:issue-13698.rs
 // ignore-cross-compile
 
+// https://github.com/rust-lang/rust/issues/13698
+#![crate_name="issue_13698"]
+
 extern crate issue_13698;
 
 pub struct Foo;
diff --git a/tests/rustdoc/issue-18199.rs b/tests/rustdoc/doc-test-attr-18199.rs
similarity index 79%
rename from tests/rustdoc/issue-18199.rs
rename to tests/rustdoc/doc-test-attr-18199.rs
index 9cc58b162f37e..c9d2235321c87 100644
--- a/tests/rustdoc/issue-18199.rs
+++ b/tests/rustdoc/doc-test-attr-18199.rs
@@ -1,4 +1,5 @@
 // compile-flags:--test
+// https://github.com/rust-lang/rust/issues/18199
 
 #![doc(test(attr(feature(staged_api))))]
 
diff --git a/tests/rustdoc/issue-15347.rs b/tests/rustdoc/document-hidden-items-15347.rs
similarity index 61%
rename from tests/rustdoc/issue-15347.rs
rename to tests/rustdoc/document-hidden-items-15347.rs
index e93d74011681b..d8a760e566602 100644
--- a/tests/rustdoc/issue-15347.rs
+++ b/tests/rustdoc/document-hidden-items-15347.rs
@@ -1,4 +1,7 @@
 // compile-flags: -Z unstable-options --document-hidden-items
+// https://github.com/rust-lang/rust/issues/15347
+
+#![crate_name="issue_15347"]
 
 // @has issue_15347/fn.foo.html
 #[doc(hidden)]
diff --git a/tests/rustdoc/issue-12834.rs b/tests/rustdoc/highlight-invalid-rust-12834.rs
similarity index 80%
rename from tests/rustdoc/issue-12834.rs
rename to tests/rustdoc/highlight-invalid-rust-12834.rs
index 9605a1e78c105..f8acc5002648f 100644
--- a/tests/rustdoc/issue-12834.rs
+++ b/tests/rustdoc/highlight-invalid-rust-12834.rs
@@ -1,6 +1,8 @@
 // Tests that failing to syntax highlight a rust code-block doesn't cause
 // rustdoc to fail, while still rendering the code-block (without highlighting).
+// https://github.com/rust-lang/rust/issues/12834
 
+#![crate_name="issue_12834"]
 #![allow(rustdoc::invalid_rust_codeblocks)]
 
 // @has issue_12834/fn.foo.html
diff --git a/tests/rustdoc/issue-19181.rs b/tests/rustdoc/ice-type-error-19181.rs
similarity index 68%
rename from tests/rustdoc/issue-19181.rs
rename to tests/rustdoc/ice-type-error-19181.rs
index 3dea152fc6ecb..3ced613666406 100644
--- a/tests/rustdoc/issue-19181.rs
+++ b/tests/rustdoc/ice-type-error-19181.rs
@@ -1,4 +1,5 @@
 // compile-flags:--test
+// https://github.com/rust-lang/rust/issues/19181
 
 // rustdoc should not panic when target crate has compilation errors
 
diff --git a/tests/rustdoc/issue-20175.rs b/tests/rustdoc/impl-ref-20175.rs
similarity index 68%
rename from tests/rustdoc/issue-20175.rs
rename to tests/rustdoc/impl-ref-20175.rs
index 6a42e2afbf43c..a92db2d0a665b 100644
--- a/tests/rustdoc/issue-20175.rs
+++ b/tests/rustdoc/impl-ref-20175.rs
@@ -1,3 +1,7 @@
+// https://github.com/rust-lang/rust/issues/20175
+
+#![crate_name="issue_20175"]
+
 pub trait Foo {
     fn foo(&self) {}
 }
diff --git a/tests/rustdoc/issue-16265-1.rs b/tests/rustdoc/infinite-redirection-16265-1.rs
similarity index 71%
rename from tests/rustdoc/issue-16265-1.rs
rename to tests/rustdoc/infinite-redirection-16265-1.rs
index 2fda637a64131..7d72469bd72c7 100644
--- a/tests/rustdoc/issue-16265-1.rs
+++ b/tests/rustdoc/infinite-redirection-16265-1.rs
@@ -1,3 +1,6 @@
+// https://github.com/rust-lang/rust/issues/16265
+#![crate_name="issue_16265_1"]
+
 pub struct Foo;
 
 // @hasraw issue_16265_1/traits/index.html 'source'
diff --git a/tests/rustdoc/issue-16265-2.rs b/tests/rustdoc/infinite-redirection-16265-2.rs
similarity index 50%
rename from tests/rustdoc/issue-16265-2.rs
rename to tests/rustdoc/infinite-redirection-16265-2.rs
index c3eb356171e85..7a4791c5fd487 100644
--- a/tests/rustdoc/issue-16265-2.rs
+++ b/tests/rustdoc/infinite-redirection-16265-2.rs
@@ -1,3 +1,6 @@
+// https://github.com/rust-lang/rust/issues/16265
+#![crate_name="issue_16265_2"]
+
 // @hasraw issue_16265_2/index.html 'source'
 
 trait Y {}
diff --git a/tests/rustdoc/issue-20727-2.rs b/tests/rustdoc/inline-assoc-type-20727-bindings.rs
similarity index 90%
rename from tests/rustdoc/issue-20727-2.rs
rename to tests/rustdoc/inline-assoc-type-20727-bindings.rs
index c1aa9617b2e25..e59dec29d030a 100644
--- a/tests/rustdoc/issue-20727-2.rs
+++ b/tests/rustdoc/inline-assoc-type-20727-bindings.rs
@@ -1,6 +1,9 @@
 // aux-build:issue-20727.rs
 // ignore-cross-compile
 
+// https://github.com/rust-lang/rust/issues/20727
+#![crate_name="issue_20727_2"]
+
 extern crate issue_20727;
 
 // @has issue_20727_2/trait.Add.html
diff --git a/tests/rustdoc/issue-20727-3.rs b/tests/rustdoc/inline-assoc-type-20727-bounds-deref.rs
similarity index 90%
rename from tests/rustdoc/issue-20727-3.rs
rename to tests/rustdoc/inline-assoc-type-20727-bounds-deref.rs
index 2f9d91fc5f724..005ee3e329416 100644
--- a/tests/rustdoc/issue-20727-3.rs
+++ b/tests/rustdoc/inline-assoc-type-20727-bounds-deref.rs
@@ -1,6 +1,9 @@
 // aux-build:issue-20727.rs
 // ignore-cross-compile
 
+// https://github.com/rust-lang/rust/issues/20727
+#![crate_name="issue_20727_3"]
+
 extern crate issue_20727;
 
 pub trait Bar {}
diff --git a/tests/rustdoc/issue-20727-4.rs b/tests/rustdoc/inline-assoc-type-20727-bounds-index.rs
similarity index 95%
rename from tests/rustdoc/issue-20727-4.rs
rename to tests/rustdoc/inline-assoc-type-20727-bounds-index.rs
index ec9f18fc3feb8..1a3f4cd20c1e2 100644
--- a/tests/rustdoc/issue-20727-4.rs
+++ b/tests/rustdoc/inline-assoc-type-20727-bounds-index.rs
@@ -1,6 +1,9 @@
 // aux-build:issue-20727.rs
 // ignore-cross-compile
 
+// https://github.com/rust-lang/rust/issues/20727
+#![crate_name="issue_20727_4"]
+
 extern crate issue_20727;
 
 // @has issue_20727_4/trait.Index.html
diff --git a/tests/rustdoc/issue-20727.rs b/tests/rustdoc/inline-assoc-type-20727-bounds.rs
similarity index 90%
rename from tests/rustdoc/issue-20727.rs
rename to tests/rustdoc/inline-assoc-type-20727-bounds.rs
index 266848beef93d..7cbc8d38107db 100644
--- a/tests/rustdoc/issue-20727.rs
+++ b/tests/rustdoc/inline-assoc-type-20727-bounds.rs
@@ -1,6 +1,9 @@
 // aux-build:issue-20727.rs
 // ignore-cross-compile
 
+// https://github.com/rust-lang/rust/issues/20727
+#![crate_name="issue_20727"]
+
 extern crate issue_20727;
 
 // @has issue_20727/trait.Deref.html
diff --git a/tests/rustdoc/issue-16019.rs b/tests/rustdoc/macro-ice-16019.rs
similarity index 75%
rename from tests/rustdoc/issue-16019.rs
rename to tests/rustdoc/macro-ice-16019.rs
index 239d92378d9bb..d0f82e0a314ce 100644
--- a/tests/rustdoc/issue-16019.rs
+++ b/tests/rustdoc/macro-ice-16019.rs
@@ -1,3 +1,5 @@
+// https://github.com/rust-lang/rust/issues/16019
+
 macro_rules! define_struct {
     ($rounds:expr) => (
         struct Struct {
diff --git a/tests/rustdoc/issue-17476.rs b/tests/rustdoc/method-link-foreign-trait-impl-17476.rs
similarity index 76%
rename from tests/rustdoc/issue-17476.rs
rename to tests/rustdoc/method-link-foreign-trait-impl-17476.rs
index a5b484c985fff..e52ab6f38c2a5 100644
--- a/tests/rustdoc/issue-17476.rs
+++ b/tests/rustdoc/method-link-foreign-trait-impl-17476.rs
@@ -1,5 +1,8 @@
 // aux-build:issue-17476.rs
 // ignore-cross-compile
+// https://github.com/rust-lang/rust/issues/17476
+
+#![crate_name="issue_17476"]
 
 extern crate issue_17476;
 
diff --git a/tests/rustdoc/issue-15318-3.rs b/tests/rustdoc/primitive-raw-pointer-dox-15318-3.rs
similarity index 61%
rename from tests/rustdoc/issue-15318-3.rs
rename to tests/rustdoc/primitive-raw-pointer-dox-15318-3.rs
index 2dab8f9488391..80c559756870c 100644
--- a/tests/rustdoc/issue-15318-3.rs
+++ b/tests/rustdoc/primitive-raw-pointer-dox-15318-3.rs
@@ -1,3 +1,5 @@
+// https://github.com/rust-lang/rust/issues/15318
+#![crate_name="issue_15318_3"]
 #![feature(rustc_attrs)]
 
 // @has issue_15318_3/primitive.pointer.html
diff --git a/tests/rustdoc/issue-15318.rs b/tests/rustdoc/primitive-raw-pointer-link-15318.rs
similarity index 76%
rename from tests/rustdoc/issue-15318.rs
rename to tests/rustdoc/primitive-raw-pointer-link-15318.rs
index 0349fe2854c8a..77f25ff4cff08 100644
--- a/tests/rustdoc/issue-15318.rs
+++ b/tests/rustdoc/primitive-raw-pointer-link-15318.rs
@@ -1,6 +1,8 @@
 // aux-build:issue-15318.rs
 // ignore-cross-compile
+// https://github.com/rust-lang/rust/issues/15318
 
+#![crate_name="issue_15318"]
 #![no_std]
 
 extern crate issue_15318;
diff --git a/tests/rustdoc/issue-15318-2.rs b/tests/rustdoc/primitive-raw-pointer-link-no-inlined-15318-2.rs
similarity index 75%
rename from tests/rustdoc/issue-15318-2.rs
rename to tests/rustdoc/primitive-raw-pointer-link-no-inlined-15318-2.rs
index 614f2c1c08e87..1b35bb185ed48 100644
--- a/tests/rustdoc/issue-15318-2.rs
+++ b/tests/rustdoc/primitive-raw-pointer-link-no-inlined-15318-2.rs
@@ -1,5 +1,8 @@
 // aux-build:issue-15318.rs
 // ignore-cross-compile
+// https://github.com/rust-lang/rust/issues/15318
+
+#![crate_name="issue_15318_2"]
 #![no_std]
 
 extern crate issue_15318;
diff --git a/tests/ui/foreign/foreign-fn-linkname.rs b/tests/ui/foreign/foreign-fn-linkname.rs
index f6d820594f966..d1d6e703e3dd4 100644
--- a/tests/ui/foreign/foreign-fn-linkname.rs
+++ b/tests/ui/foreign/foreign-fn-linkname.rs
@@ -2,6 +2,9 @@
 // ignore-wasm32-bare no libc to test ffi with
 // ignore-sgx no libc
 
+// Ensure no false positive on "unused extern crate" lint
+#![deny(unused_extern_crates)]
+
 #![feature(rustc_private)]
 
 extern crate libc;