Add primitive documentation to libcore

This works by doing two things:
- Adding links that are specific to the crate. Since not all primitive
  items are defined in `core` (due to lang_items), these need to use
  relative links and not intra-doc links.
- Duplicating `primitive_docs` in both core and std. This allows not needing CARGO_PKG_NAME to build the standard library. It also adds a tidy check to make sure they stay the same.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/test/rustdoc/primitive/no_std.rs b/src/test/rustdoc/primitive/no_std.rs
new file mode 100644
index 00000000000..8d05a8e6e01
--- /dev/null
+++ b/src/test/rustdoc/primitive/no_std.rs
@@ -0,0 +1,5 @@
+#![no_std]
+
+// @has no_std/fn.foo.html '//a/[@href="{{channel}}/core/primitive.u8.html"]' 'u8'
+// Link to [u8]
+pub fn foo() -> u8 {}