Rollup merge of rust-lang#78114 - jyn514:private, r=oli-obk

Recognize `private_intra_doc_links` as a lint

Previously, trying to allow this would give another error!

```
warning: unknown lint: `private_intra_doc_links`
 --> private.rs:1:10
  |
1 | #![allow(private_intra_doc_links)]
  |          ^^^^^^^^^^^^^^^^^^^^^^^ help: did you mean: `broken_intra_doc_links`
  |
  = note: `#[warn(unknown_lints)]` on by default

warning: public documentation for `DocMe` links to private item `DontDocMe`
 --> private.rs:2:11
  |
2 | /// docs [DontDocMe]
  |           ^^^^^^^^^ this item is private
  |
  = note: `#[warn(private_intra_doc_links)]` on by default
  = note: this link will resolve properly if you pass `--document-private-items`
```

Fixes the issue found in rust-lang#77249 (comment).

r? `````@Manishearth`````

Does anyone know why this additional step is necessary? It seems weird this has to be declared in 3 different places.

compiler/rustc_lint_defs/src/builtin.rs

@@ -2801,6 +2801,7 @@ declare_lint_pass! {
         UNSTABLE_NAME_COLLISIONS,
         IRREFUTABLE_LET_PATTERNS,
         BROKEN_INTRA_DOC_LINKS,
+        PRIVATE_INTRA_DOC_LINKS,
         INVALID_CODEBLOCK_ATTRIBUTES,
         MISSING_CRATE_LEVEL_DOCS,
         MISSING_DOC_CODE_EXAMPLES,

src/librustdoc/core.rs

@@ -322,7 +322,8 @@ pub fn run_core(
     let cpath = Some(input.clone());
     let input = Input::File(input);
 
-    let intra_link_resolution_failure_name = lint::builtin::BROKEN_INTRA_DOC_LINKS.name;
+    let broken_intra_doc_links = lint::builtin::BROKEN_INTRA_DOC_LINKS.name;
+    let private_intra_doc_links = lint::builtin::PRIVATE_INTRA_DOC_LINKS.name;
     let missing_docs = rustc_lint::builtin::MISSING_DOCS.name;
     let missing_doc_example = rustc_lint::builtin::MISSING_DOC_CODE_EXAMPLES.name;
     let private_doc_tests = rustc_lint::builtin::PRIVATE_DOC_TESTS.name;
@@ -336,7 +337,8 @@ pub fn run_core(
     // In addition to those specific lints, we also need to allow those given through
     // command line, otherwise they'll get ignored and we don't want that.
     let lints_to_show = vec![
-        intra_link_resolution_failure_name.to_owned(),
+        broken_intra_doc_links.to_owned(),
+        private_intra_doc_links.to_owned(),
         missing_docs.to_owned(),
         missing_doc_example.to_owned(),
         private_doc_tests.to_owned(),
@@ -349,9 +351,8 @@ pub fn run_core(
     ];
 
     let (lint_opts, lint_caps) = init_lints(lints_to_show, lint_opts, |lint| {
-        if lint.name == intra_link_resolution_failure_name
-            || lint.name == invalid_codeblock_attributes_name
-        {
+        // FIXME: why is this necessary?
+        if lint.name == broken_intra_doc_links || lint.name == invalid_codeblock_attributes_name {
             None
         } else {
             Some((lint.name_lower(), lint::Allow))