rand -> my_rand

This fixes a failure in stage2 rustdoc tests.

src/test/rustdoc/intra-doc-crate/additional_doc.rs

@@ -2,9 +2,9 @@
 // build-aux-docs
 #![deny(intra_doc_resolution_failure)]
 
-extern crate rand;
+extern crate my_rand;
 
 // @has 'additional_doc/trait.Rng.html' '//a[@href="../additional_doc/trait.Rng.html"]' 'Rng'
-// @has 'additional_doc/trait.Rng.html' '//a[@href="../rand/trait.RngCore.html"]' 'RngCore'
+// @has 'additional_doc/trait.Rng.html' '//a[@href="../my_rand/trait.RngCore.html"]' 'RngCore'
 /// This is an [`Rng`].
-pub use rand::Rng;
+pub use my_rand::Rng;

src/test/rustdoc/intra-doc-crate/auxiliary/additional_doc.rs

@@ -1,4 +1,4 @@
-#![crate_name = "rand"]
+#![crate_name = "my_rand"]
 #![deny(intra_doc_resolution_failure)]
 
 pub trait RngCore {}