Address review comments

- Move MISSING_CRATE_LEVEL_DOCS to rustdoc directly
- Update documentation

This also takes the opportunity to make the `no-crate-level-doc-lint`
test more specific.

3 files changed, 18 insertions, 5 deletions

diff --git a/src/test/rustdoc-ui/check.stderr b/src/test/rustdoc-ui/check.stderr
index 3c29a45a64a..e6ba9df9b05 100644
--- a/src/test/rustdoc-ui/check.stderr
+++ b/src/test/rustdoc-ui/check.stderr
@@ -21,6 +21,17 @@ warning: missing documentation for a function
 LL | pub fn foo() {}
    | ^^^^^^^^^^^^
 
+warning: no documentation found for this crate's top-level module
+   |
+note: the lint level is defined here
+  --> $DIR/check.rs:7:9
+   |
+LL | #![warn(rustdoc)]
+   |         ^^^^^^^
+   = note: `#[warn(rustdoc::missing_crate_level_docs)]` implied by `#[warn(rustdoc)]`
+   = help: The following guide may be of use:
+           https://doc.rust-lang.org/nightly/rustdoc/how-to-write-documentation.html
+
 warning: missing code example in this documentation
   --> $DIR/check.rs:4:1
    |
@@ -45,5 +56,5 @@ warning: missing code example in this documentation
 LL | pub fn foo() {}
    | ^^^^^^^^^^^^^^^
 
-warning: 4 warnings emitted
+warning: 5 warnings emitted
 
diff --git a/src/test/rustdoc-ui/no-crate-level-doc-lint.rs b/src/test/rustdoc-ui/no-crate-level-doc-lint.rs
index 152a7cd88bc..3939ec6827a 100644
--- a/src/test/rustdoc-ui/no-crate-level-doc-lint.rs
+++ b/src/test/rustdoc-ui/no-crate-level-doc-lint.rs
@@ -1,3 +1,5 @@
-#![deny(missing_crate_level_docs)]
+// error-pattern: no documentation found
+#![deny(rustdoc::missing_crate_level_docs)]
+//^~ NOTE defined here
 
 pub fn foo() {}
diff --git a/src/test/rustdoc-ui/no-crate-level-doc-lint.stderr b/src/test/rustdoc-ui/no-crate-level-doc-lint.stderr
index 6e7e2fb3eb7..55ead1a55cf 100644
--- a/src/test/rustdoc-ui/no-crate-level-doc-lint.stderr
+++ b/src/test/rustdoc-ui/no-crate-level-doc-lint.stderr
@@ -1,10 +1,10 @@
 error: no documentation found for this crate's top-level module
    |
 note: the lint level is defined here
-  --> $DIR/no-crate-level-doc-lint.rs:1:9
+  --> $DIR/no-crate-level-doc-lint.rs:2:9
    |
-LL | #![deny(missing_crate_level_docs)]
-   |         ^^^^^^^^^^^^^^^^^^^^^^^^
+LL | #![deny(rustdoc::missing_crate_level_docs)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = help: The following guide may be of use:
            https://doc.rust-lang.org/nightly/rustdoc/how-to-write-documentation.html