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-rw-r--r--src/doc/rustdoc/src/advanced-features.md7
-rw-r--r--src/librustdoc/clean/types.rs23
-rw-r--r--src/test/rustdoc-ui/check-doc-alias-attr.rs14
-rw-r--r--src/test/rustdoc-ui/check-doc-alias-attr.stderr72
-rw-r--r--src/test/ui/proc-macro/group-compat-hack/auxiliary/pin-project-internal-0.4.0.rs (renamed from src/test/ui/proc-macro/group-compat-hack/auxiliary/group-compat-hack.rs)4
-rw-r--r--src/test/ui/proc-macro/group-compat-hack/group-compat-hack.rs8
-rw-r--r--src/test/ui/proc-macro/group-compat-hack/group-compat-hack.stderr68
-rw-r--r--src/test/ui/proc-macro/group-compat-hack/group-compat-hack.stdout6
-rw-r--r--src/test/ui/rustdoc/check-doc-alias-attr.rs14
-rw-r--r--src/test/ui/rustdoc/check-doc-alias-attr.stderr72
-rw-r--r--src/tools/tidy/src/deps.rs1
11 files changed, 252 insertions, 37 deletions
diff --git a/src/doc/rustdoc/src/advanced-features.md b/src/doc/rustdoc/src/advanced-features.md
index abdc2e4025d..6147bd0a97a 100644
--- a/src/doc/rustdoc/src/advanced-features.md
+++ b/src/doc/rustdoc/src/advanced-features.md
@@ -81,3 +81,10 @@ Then, when looking for it through the `rustdoc` search, if you enter "x" or
 "big", search will show the `BigX` struct first.
 
 There are some limitations on the doc alias names though: you can't use `"` or whitespace.
+
+You can add multiple aliases at the same time by using a list:
+
+```rust,no_run
+#[doc(alias("x", "big"))]
+pub struct BigX;
+```
diff --git a/src/librustdoc/clean/types.rs b/src/librustdoc/clean/types.rs
index 114b68c56b8..840a42c2b8a 100644
--- a/src/librustdoc/clean/types.rs
+++ b/src/librustdoc/clean/types.rs
@@ -910,12 +910,23 @@ impl Attributes {
     }
 
     crate fn get_doc_aliases(&self) -> FxHashSet<String> {
-        self.other_attrs
-            .lists(sym::doc)
-            .filter(|a| a.has_name(sym::alias))
-            .filter_map(|a| a.value_str().map(|s| s.to_string()))
-            .filter(|v| !v.is_empty())
-            .collect::<FxHashSet<_>>()
+        let mut aliases = FxHashSet::default();
+
+        for attr in self.other_attrs.lists(sym::doc).filter(|a| a.has_name(sym::alias)) {
+            if let Some(values) = attr.meta_item_list() {
+                for l in values {
+                    match l.literal().unwrap().kind {
+                        ast::LitKind::Str(s, _) => {
+                            aliases.insert(s.as_str().to_string());
+                        }
+                        _ => unreachable!(),
+                    }
+                }
+            } else {
+                aliases.insert(attr.value_str().map(|s| s.to_string()).unwrap());
+            }
+        }
+        aliases
     }
 }
 
diff --git a/src/test/rustdoc-ui/check-doc-alias-attr.rs b/src/test/rustdoc-ui/check-doc-alias-attr.rs
index 912e35f9165..719b98604c4 100644
--- a/src/test/rustdoc-ui/check-doc-alias-attr.rs
+++ b/src/test/rustdoc-ui/check-doc-alias-attr.rs
@@ -1,11 +1,11 @@
 #![crate_type = "lib"]
 
 #[doc(alias = "foo")] // ok!
+#[doc(alias("bar", "baz"))] // ok!
 pub struct Bar;
 
 #[doc(alias)] //~ ERROR
 #[doc(alias = 0)] //~ ERROR
-#[doc(alias("bar"))] //~ ERROR
 #[doc(alias = "\"")] //~ ERROR
 #[doc(alias = "\n")] //~ ERROR
 #[doc(alias = "
@@ -13,4 +13,16 @@ pub struct Bar;
 #[doc(alias = "\t")] //~ ERROR
 #[doc(alias = " hello")] //~ ERROR
 #[doc(alias = "hello ")] //~ ERROR
+#[doc(alias = "")] //~ ERROR
 pub struct Foo;
+
+#[doc(alias(0))] //~ ERROR
+#[doc(alias("\""))] //~ ERROR
+#[doc(alias("\n"))] //~ ERROR
+#[doc(alias("
+"))] //~^ ERROR
+#[doc(alias("\t"))] //~ ERROR
+#[doc(alias(" hello"))] //~ ERROR
+#[doc(alias("hello "))] //~ ERROR
+#[doc(alias(""))] //~ ERROR
+pub struct Foo2;
diff --git a/src/test/rustdoc-ui/check-doc-alias-attr.stderr b/src/test/rustdoc-ui/check-doc-alias-attr.stderr
index 1c7fc83bb8d..f99d69dc101 100644
--- a/src/test/rustdoc-ui/check-doc-alias-attr.stderr
+++ b/src/test/rustdoc-ui/check-doc-alias-attr.stderr
@@ -1,21 +1,15 @@
-error: doc alias attribute expects a string: #[doc(alias = "a")]
-  --> $DIR/check-doc-alias-attr.rs:6:7
+error: doc alias attribute expects a string `#[doc(alias = "a")]` or a list of strings `#[doc(alias("a", "b"))]`
+  --> $DIR/check-doc-alias-attr.rs:7:7
    |
 LL | #[doc(alias)]
    |       ^^^^^
 
-error: doc alias attribute expects a string: #[doc(alias = "a")]
-  --> $DIR/check-doc-alias-attr.rs:7:7
+error: doc alias attribute expects a string `#[doc(alias = "a")]` or a list of strings `#[doc(alias("a", "b"))]`
+  --> $DIR/check-doc-alias-attr.rs:8:7
    |
 LL | #[doc(alias = 0)]
    |       ^^^^^^^^^
 
-error: doc alias attribute expects a string: #[doc(alias = "a")]
-  --> $DIR/check-doc-alias-attr.rs:8:7
-   |
-LL | #[doc(alias("bar"))]
-   |       ^^^^^^^^^^^^
-
 error: '\"' character isn't allowed in `#[doc(alias = "...")]`
   --> $DIR/check-doc-alias-attr.rs:9:15
    |
@@ -54,5 +48,61 @@ error: `#[doc(alias = "...")]` cannot start or end with ' '
 LL | #[doc(alias = "hello ")]
    |               ^^^^^^^^
 
-error: aborting due to 9 previous errors
+error: `#[doc(alias = "...")]` attribute cannot have empty value
+  --> $DIR/check-doc-alias-attr.rs:16:15
+   |
+LL | #[doc(alias = "")]
+   |               ^^
+
+error: `#[doc(alias("a"))]` expects string literals
+  --> $DIR/check-doc-alias-attr.rs:19:13
+   |
+LL | #[doc(alias(0))]
+   |             ^
+
+error: '\"' character isn't allowed in `#[doc(alias("..."))]`
+  --> $DIR/check-doc-alias-attr.rs:20:13
+   |
+LL | #[doc(alias("\""))]
+   |             ^^^^
+
+error: '\n' character isn't allowed in `#[doc(alias("..."))]`
+  --> $DIR/check-doc-alias-attr.rs:21:13
+   |
+LL | #[doc(alias("\n"))]
+   |             ^^^^
+
+error: '\n' character isn't allowed in `#[doc(alias("..."))]`
+  --> $DIR/check-doc-alias-attr.rs:22:13
+   |
+LL |   #[doc(alias("
+   |  _____________^
+LL | | "))]
+   | |_^
+
+error: '\t' character isn't allowed in `#[doc(alias("..."))]`
+  --> $DIR/check-doc-alias-attr.rs:24:13
+   |
+LL | #[doc(alias("\t"))]
+   |             ^^^^
+
+error: `#[doc(alias("..."))]` cannot start or end with ' '
+  --> $DIR/check-doc-alias-attr.rs:25:13
+   |
+LL | #[doc(alias(" hello"))]
+   |             ^^^^^^^^
+
+error: `#[doc(alias("..."))]` cannot start or end with ' '
+  --> $DIR/check-doc-alias-attr.rs:26:13
+   |
+LL | #[doc(alias("hello "))]
+   |             ^^^^^^^^
+
+error: `#[doc(alias("..."))]` attribute cannot have empty value
+  --> $DIR/check-doc-alias-attr.rs:27:13
+   |
+LL | #[doc(alias(""))]
+   |             ^^
+
+error: aborting due to 17 previous errors
 
diff --git a/src/test/ui/proc-macro/group-compat-hack/auxiliary/group-compat-hack.rs b/src/test/ui/proc-macro/group-compat-hack/auxiliary/pin-project-internal-0.4.0.rs
index 5cd3b40a2e4..baa4fd3a105 100644
--- a/src/test/ui/proc-macro/group-compat-hack/auxiliary/group-compat-hack.rs
+++ b/src/test/ui/proc-macro/group-compat-hack/auxiliary/pin-project-internal-0.4.0.rs
@@ -2,6 +2,10 @@
 // no-prefer-dynamic
 
 #![crate_type = "proc-macro"]
+#![crate_name = "group_compat_hack"]
+
+// This file has an unusual name in order to trigger the back-compat
+// code in the compiler
 
 extern crate proc_macro;
 use proc_macro::TokenStream;
diff --git a/src/test/ui/proc-macro/group-compat-hack/group-compat-hack.rs b/src/test/ui/proc-macro/group-compat-hack/group-compat-hack.rs
index 7f3f5e36f50..d9687490cad 100644
--- a/src/test/ui/proc-macro/group-compat-hack/group-compat-hack.rs
+++ b/src/test/ui/proc-macro/group-compat-hack/group-compat-hack.rs
@@ -1,5 +1,5 @@
 // check-pass
-// aux-build:group-compat-hack.rs
+// aux-build:pin-project-internal-0.4.0.rs
 // compile-flags: -Z span-debug
 
 #![no_std] // Don't load unnecessary hygiene information from std
@@ -51,14 +51,16 @@ mod actix_web_test {
     include!("actix-web/src/extract.rs");
 
     struct Foo;
-    tuple_from_req!(Foo);
+    tuple_from_req!(Foo); //~ WARN using an old version
+    //~| WARN this was previously
 }
 
 mod actix_web_version_test {
     include!("actix-web-2.0.0/src/extract.rs");
 
     struct Foo;
-    tuple_from_req!(Foo);
+    tuple_from_req!(Foo); //~ WARN using an old version
+    //~| WARN this was previously
 }
 
 mod actori_web_test {
diff --git a/src/test/ui/proc-macro/group-compat-hack/group-compat-hack.stderr b/src/test/ui/proc-macro/group-compat-hack/group-compat-hack.stderr
index 9370440a635..e2b680f8d27 100644
--- a/src/test/ui/proc-macro/group-compat-hack/group-compat-hack.stderr
+++ b/src/test/ui/proc-macro/group-compat-hack/group-compat-hack.stderr
@@ -31,7 +31,39 @@ LL |     impl_macros!(Foo);
    = note: the `time-macros-impl` crate will stop compiling in futures version of Rust. Please update to the latest version of the `time` crate to avoid breakage
    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
-warning: 2 warnings emitted
+warning: using an old version of `actix-web`
+  --> $DIR/actix-web/src/extract.rs:5:34
+   |
+LL |         #[my_macro] struct Three($T);
+   |                                  ^^
+   | 
+  ::: $DIR/group-compat-hack.rs:54:5
+   |
+LL |     tuple_from_req!(Foo);
+   |     --------------------- in this macro invocation
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #83125 <https://github.com/rust-lang/rust/issues/83125>
+   = note: the version of `actix-web` you are using might stop compiling in future versions of Rust; please update to the latest version of the `actix-web` crate to avoid breakage
+   = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
+
+warning: using an old version of `actix-web`
+  --> $DIR/actix-web-2.0.0/src/extract.rs:5:34
+   |
+LL |         #[my_macro] struct Three($T);
+   |                                  ^^
+   | 
+  ::: $DIR/group-compat-hack.rs:62:5
+   |
+LL |     tuple_from_req!(Foo);
+   |     --------------------- in this macro invocation
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #83125 <https://github.com/rust-lang/rust/issues/83125>
+   = note: the version of `actix-web` you are using might stop compiling in future versions of Rust; please update to the latest version of the `actix-web` crate to avoid breakage
+   = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
+
+warning: 4 warnings emitted
 
 Future incompatibility report: Future breakage date: None, diagnostic:
 warning: using an old version of `time-macros-impl`
@@ -68,3 +100,37 @@ LL |     impl_macros!(Foo);
    = note: the `time-macros-impl` crate will stop compiling in futures version of Rust. Please update to the latest version of the `time` crate to avoid breakage
    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
+Future breakage date: None, diagnostic:
+warning: using an old version of `actix-web`
+  --> $DIR/actix-web/src/extract.rs:5:34
+   |
+LL |         #[my_macro] struct Three($T);
+   |                                  ^^
+   | 
+  ::: $DIR/group-compat-hack.rs:54:5
+   |
+LL |     tuple_from_req!(Foo);
+   |     --------------------- in this macro invocation
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #83125 <https://github.com/rust-lang/rust/issues/83125>
+   = note: the version of `actix-web` you are using might stop compiling in future versions of Rust; please update to the latest version of the `actix-web` crate to avoid breakage
+   = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
+
+Future breakage date: None, diagnostic:
+warning: using an old version of `actix-web`
+  --> $DIR/actix-web-2.0.0/src/extract.rs:5:34
+   |
+LL |         #[my_macro] struct Three($T);
+   |                                  ^^
+   | 
+  ::: $DIR/group-compat-hack.rs:62:5
+   |
+LL |     tuple_from_req!(Foo);
+   |     --------------------- in this macro invocation
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #83125 <https://github.com/rust-lang/rust/issues/83125>
+   = note: the version of `actix-web` you are using might stop compiling in future versions of Rust; please update to the latest version of the `actix-web` crate to avoid breakage
+   = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
+
diff --git a/src/test/ui/proc-macro/group-compat-hack/group-compat-hack.stdout b/src/test/ui/proc-macro/group-compat-hack/group-compat-hack.stdout
index 468cb511915..3fe744e12ff 100644
--- a/src/test/ui/proc-macro/group-compat-hack/group-compat-hack.stdout
+++ b/src/test/ui/proc-macro/group-compat-hack/group-compat-hack.stdout
@@ -5,6 +5,6 @@ Called proc_macro_hack with TokenStream [Ident { ident: "struct", span: $DIR/tim
 Called proc_macro_hack with TokenStream [Ident { ident: "struct", span: $DIR/js-sys-0.3.17/src/lib.rs:5:21: 5:27 (#24) }, Ident { ident: "Two", span: $DIR/js-sys-0.3.17/src/lib.rs:5:28: 5:31 (#24) }, Group { delimiter: Parenthesis, stream: TokenStream [Ident { ident: "Foo", span: $DIR/group-compat-hack.rs:46:13: 46:16 (#0) }], span: $DIR/js-sys-0.3.17/src/lib.rs:5:31: 5:38 (#24) }, Punct { ch: ';', spacing: Alone, span: $DIR/js-sys-0.3.17/src/lib.rs:5:38: 5:39 (#24) }]
 Called proc_macro_hack with TokenStream [Ident { ident: "struct", span: $DIR/group-compat-hack.rs:39:25: 39:31 (#28) }, Ident { ident: "Three", span: $DIR/group-compat-hack.rs:39:32: 39:37 (#28) }, Group { delimiter: Parenthesis, stream: TokenStream [Group { delimiter: None, stream: TokenStream [Ident { ident: "Foo", span: $DIR/group-compat-hack.rs:47:12: 47:15 (#0) }], span: $DIR/group-compat-hack.rs:39:38: 39:43 (#28) }], span: $DIR/group-compat-hack.rs:39:37: 39:44 (#28) }, Punct { ch: ';', spacing: Alone, span: $DIR/group-compat-hack.rs:39:44: 39:45 (#28) }]
 Called proc_macro_hack with TokenStream [Ident { ident: "struct", span: $DIR/actix-web/src/extract.rs:5:21: 5:27 (#33) }, Ident { ident: "Three", span: $DIR/actix-web/src/extract.rs:5:28: 5:33 (#33) }, Group { delimiter: Parenthesis, stream: TokenStream [Ident { ident: "Foo", span: $DIR/group-compat-hack.rs:54:21: 54:24 (#0) }], span: $DIR/actix-web/src/extract.rs:5:33: 5:37 (#33) }, Punct { ch: ';', spacing: Alone, span: $DIR/actix-web/src/extract.rs:5:37: 5:38 (#33) }]
-Called proc_macro_hack with TokenStream [Ident { ident: "struct", span: $DIR/actix-web-2.0.0/src/extract.rs:5:21: 5:27 (#38) }, Ident { ident: "Three", span: $DIR/actix-web-2.0.0/src/extract.rs:5:28: 5:33 (#38) }, Group { delimiter: Parenthesis, stream: TokenStream [Ident { ident: "Foo", span: $DIR/group-compat-hack.rs:61:21: 61:24 (#0) }], span: $DIR/actix-web-2.0.0/src/extract.rs:5:33: 5:37 (#38) }, Punct { ch: ';', spacing: Alone, span: $DIR/actix-web-2.0.0/src/extract.rs:5:37: 5:38 (#38) }]
-Called proc_macro_hack with TokenStream [Ident { ident: "struct", span: $DIR/actori-web/src/extract.rs:5:21: 5:27 (#43) }, Ident { ident: "Four", span: $DIR/actori-web/src/extract.rs:5:28: 5:32 (#43) }, Group { delimiter: Parenthesis, stream: TokenStream [Ident { ident: "Foo", span: $DIR/group-compat-hack.rs:68:21: 68:24 (#0) }], span: $DIR/actori-web/src/extract.rs:5:32: 5:36 (#43) }, Punct { ch: ';', spacing: Alone, span: $DIR/actori-web/src/extract.rs:5:36: 5:37 (#43) }]
-Called proc_macro_hack with TokenStream [Ident { ident: "struct", span: $DIR/actori-web-2.0.0/src/extract.rs:5:21: 5:27 (#48) }, Ident { ident: "Four", span: $DIR/actori-web-2.0.0/src/extract.rs:5:28: 5:32 (#48) }, Group { delimiter: Parenthesis, stream: TokenStream [Ident { ident: "Foo", span: $DIR/group-compat-hack.rs:75:21: 75:24 (#0) }], span: $DIR/actori-web-2.0.0/src/extract.rs:5:32: 5:36 (#48) }, Punct { ch: ';', spacing: Alone, span: $DIR/actori-web-2.0.0/src/extract.rs:5:36: 5:37 (#48) }]
+Called proc_macro_hack with TokenStream [Ident { ident: "struct", span: $DIR/actix-web-2.0.0/src/extract.rs:5:21: 5:27 (#38) }, Ident { ident: "Three", span: $DIR/actix-web-2.0.0/src/extract.rs:5:28: 5:33 (#38) }, Group { delimiter: Parenthesis, stream: TokenStream [Ident { ident: "Foo", span: $DIR/group-compat-hack.rs:62:21: 62:24 (#0) }], span: $DIR/actix-web-2.0.0/src/extract.rs:5:33: 5:37 (#38) }, Punct { ch: ';', spacing: Alone, span: $DIR/actix-web-2.0.0/src/extract.rs:5:37: 5:38 (#38) }]
+Called proc_macro_hack with TokenStream [Ident { ident: "struct", span: $DIR/actori-web/src/extract.rs:5:21: 5:27 (#43) }, Ident { ident: "Four", span: $DIR/actori-web/src/extract.rs:5:28: 5:32 (#43) }, Group { delimiter: Parenthesis, stream: TokenStream [Group { delimiter: None, stream: TokenStream [Ident { ident: "Foo", span: $DIR/group-compat-hack.rs:70:21: 70:24 (#0) }], span: $DIR/actori-web/src/extract.rs:5:33: 5:35 (#43) }], span: $DIR/actori-web/src/extract.rs:5:32: 5:36 (#43) }, Punct { ch: ';', spacing: Alone, span: $DIR/actori-web/src/extract.rs:5:36: 5:37 (#43) }]
+Called proc_macro_hack with TokenStream [Ident { ident: "struct", span: $DIR/actori-web-2.0.0/src/extract.rs:5:21: 5:27 (#48) }, Ident { ident: "Four", span: $DIR/actori-web-2.0.0/src/extract.rs:5:28: 5:32 (#48) }, Group { delimiter: Parenthesis, stream: TokenStream [Group { delimiter: None, stream: TokenStream [Ident { ident: "Foo", span: $DIR/group-compat-hack.rs:77:21: 77:24 (#0) }], span: $DIR/actori-web-2.0.0/src/extract.rs:5:33: 5:35 (#48) }], span: $DIR/actori-web-2.0.0/src/extract.rs:5:32: 5:36 (#48) }, Punct { ch: ';', spacing: Alone, span: $DIR/actori-web-2.0.0/src/extract.rs:5:36: 5:37 (#48) }]
diff --git a/src/test/ui/rustdoc/check-doc-alias-attr.rs b/src/test/ui/rustdoc/check-doc-alias-attr.rs
index 912e35f9165..719b98604c4 100644
--- a/src/test/ui/rustdoc/check-doc-alias-attr.rs
+++ b/src/test/ui/rustdoc/check-doc-alias-attr.rs
@@ -1,11 +1,11 @@
 #![crate_type = "lib"]
 
 #[doc(alias = "foo")] // ok!
+#[doc(alias("bar", "baz"))] // ok!
 pub struct Bar;
 
 #[doc(alias)] //~ ERROR
 #[doc(alias = 0)] //~ ERROR
-#[doc(alias("bar"))] //~ ERROR
 #[doc(alias = "\"")] //~ ERROR
 #[doc(alias = "\n")] //~ ERROR
 #[doc(alias = "
@@ -13,4 +13,16 @@ pub struct Bar;
 #[doc(alias = "\t")] //~ ERROR
 #[doc(alias = " hello")] //~ ERROR
 #[doc(alias = "hello ")] //~ ERROR
+#[doc(alias = "")] //~ ERROR
 pub struct Foo;
+
+#[doc(alias(0))] //~ ERROR
+#[doc(alias("\""))] //~ ERROR
+#[doc(alias("\n"))] //~ ERROR
+#[doc(alias("
+"))] //~^ ERROR
+#[doc(alias("\t"))] //~ ERROR
+#[doc(alias(" hello"))] //~ ERROR
+#[doc(alias("hello "))] //~ ERROR
+#[doc(alias(""))] //~ ERROR
+pub struct Foo2;
diff --git a/src/test/ui/rustdoc/check-doc-alias-attr.stderr b/src/test/ui/rustdoc/check-doc-alias-attr.stderr
index 1c7fc83bb8d..f99d69dc101 100644
--- a/src/test/ui/rustdoc/check-doc-alias-attr.stderr
+++ b/src/test/ui/rustdoc/check-doc-alias-attr.stderr
@@ -1,21 +1,15 @@
-error: doc alias attribute expects a string: #[doc(alias = "a")]
-  --> $DIR/check-doc-alias-attr.rs:6:7
+error: doc alias attribute expects a string `#[doc(alias = "a")]` or a list of strings `#[doc(alias("a", "b"))]`
+  --> $DIR/check-doc-alias-attr.rs:7:7
    |
 LL | #[doc(alias)]
    |       ^^^^^
 
-error: doc alias attribute expects a string: #[doc(alias = "a")]
-  --> $DIR/check-doc-alias-attr.rs:7:7
+error: doc alias attribute expects a string `#[doc(alias = "a")]` or a list of strings `#[doc(alias("a", "b"))]`
+  --> $DIR/check-doc-alias-attr.rs:8:7
    |
 LL | #[doc(alias = 0)]
    |       ^^^^^^^^^
 
-error: doc alias attribute expects a string: #[doc(alias = "a")]
-  --> $DIR/check-doc-alias-attr.rs:8:7
-   |
-LL | #[doc(alias("bar"))]
-   |       ^^^^^^^^^^^^
-
 error: '\"' character isn't allowed in `#[doc(alias = "...")]`
   --> $DIR/check-doc-alias-attr.rs:9:15
    |
@@ -54,5 +48,61 @@ error: `#[doc(alias = "...")]` cannot start or end with ' '
 LL | #[doc(alias = "hello ")]
    |               ^^^^^^^^
 
-error: aborting due to 9 previous errors
+error: `#[doc(alias = "...")]` attribute cannot have empty value
+  --> $DIR/check-doc-alias-attr.rs:16:15
+   |
+LL | #[doc(alias = "")]
+   |               ^^
+
+error: `#[doc(alias("a"))]` expects string literals
+  --> $DIR/check-doc-alias-attr.rs:19:13
+   |
+LL | #[doc(alias(0))]
+   |             ^
+
+error: '\"' character isn't allowed in `#[doc(alias("..."))]`
+  --> $DIR/check-doc-alias-attr.rs:20:13
+   |
+LL | #[doc(alias("\""))]
+   |             ^^^^
+
+error: '\n' character isn't allowed in `#[doc(alias("..."))]`
+  --> $DIR/check-doc-alias-attr.rs:21:13
+   |
+LL | #[doc(alias("\n"))]
+   |             ^^^^
+
+error: '\n' character isn't allowed in `#[doc(alias("..."))]`
+  --> $DIR/check-doc-alias-attr.rs:22:13
+   |
+LL |   #[doc(alias("
+   |  _____________^
+LL | | "))]
+   | |_^
+
+error: '\t' character isn't allowed in `#[doc(alias("..."))]`
+  --> $DIR/check-doc-alias-attr.rs:24:13
+   |
+LL | #[doc(alias("\t"))]
+   |             ^^^^
+
+error: `#[doc(alias("..."))]` cannot start or end with ' '
+  --> $DIR/check-doc-alias-attr.rs:25:13
+   |
+LL | #[doc(alias(" hello"))]
+   |             ^^^^^^^^
+
+error: `#[doc(alias("..."))]` cannot start or end with ' '
+  --> $DIR/check-doc-alias-attr.rs:26:13
+   |
+LL | #[doc(alias("hello "))]
+   |             ^^^^^^^^
+
+error: `#[doc(alias("..."))]` attribute cannot have empty value
+  --> $DIR/check-doc-alias-attr.rs:27:13
+   |
+LL | #[doc(alias(""))]
+   |             ^^
+
+error: aborting due to 17 previous errors
 
diff --git a/src/tools/tidy/src/deps.rs b/src/tools/tidy/src/deps.rs
index 06dc16f7676..96a02038638 100644
--- a/src/tools/tidy/src/deps.rs
+++ b/src/tools/tidy/src/deps.rs
@@ -123,6 +123,7 @@ const PERMITTED_DEPENDENCIES: &[&str] = &[
     "measureme",
     "memchr",
     "memmap",
+    "memmap2",
     "memoffset",
     "miniz_oxide",
     "num_cpus",
generated by cgit-pink 1.4.1-3-g733a5 (git 2.37.1) at 2025-12-03 00:26:10 +0000