Replace some desc logic in librustc_lint with article_and_desc

src/librustc_lint/builtin.rs

@@ -349,7 +349,7 @@ impl MissingDoc {
         id: Option<hir::HirId>,
         attrs: &[ast::Attribute],
         sp: Span,
-        desc: &'static str,
+        desc: &str,
     ) {
         // If we're building a test harness, then warning about
         // documentation is probably not really relevant right now.
@@ -413,12 +413,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MissingDoc {
     }
 
     fn check_item(&mut self, cx: &LateContext<'_, '_>, it: &hir::Item<'_>) {
-        let desc = match it.kind {
-            hir::ItemKind::Fn(..) => "a function",
-            hir::ItemKind::Mod(..) => "a module",
-            hir::ItemKind::Enum(..) => "an enum",
-            hir::ItemKind::Struct(..) => "a struct",
-            hir::ItemKind::Union(..) => "a union",
+        match it.kind {
             hir::ItemKind::Trait(.., trait_item_refs) => {
                 // Issue #11592: traits are always considered exported, even when private.
                 if let hir::VisibilityKind::Inherited = it.vis.node {
@@ -428,52 +423,61 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MissingDoc {
                     }
                     return;
                 }
-                "a trait"
             }
-            hir::ItemKind::TyAlias(..) => "a type alias",
             hir::ItemKind::Impl { of_trait: Some(ref trait_ref), items, .. } => {
                 // If the trait is private, add the impl items to `private_traits` so they don't get
                 // reported for missing docs.
                 let real_trait = trait_ref.path.res.def_id();
                 if let Some(hir_id) = cx.tcx.hir().as_local_hir_id(real_trait) {
-                    match cx.tcx.hir().find(hir_id) {
-                        Some(Node::Item(item)) => {
-                            if let hir::VisibilityKind::Inherited = item.vis.node {
-                                for impl_item_ref in items {
-                                    self.private_traits.insert(impl_item_ref.id.hir_id);
-                                }
+                    if let Some(Node::Item(item)) = cx.tcx.hir().find(hir_id) {
+                        if let hir::VisibilityKind::Inherited = item.vis.node {
+                            for impl_item_ref in items {
+                                self.private_traits.insert(impl_item_ref.id.hir_id);
                             }
                         }
-                        _ => {}
                     }
                 }
                 return;
             }
-            hir::ItemKind::Const(..) => "a constant",
-            hir::ItemKind::Static(..) => "a static",
+
+            hir::ItemKind::TyAlias(..)
+            | hir::ItemKind::Fn(..)
+            | hir::ItemKind::Mod(..)
+            | hir::ItemKind::Enum(..)
+            | hir::ItemKind::Struct(..)
+            | hir::ItemKind::Union(..)
+            | hir::ItemKind::Const(..)
+            | hir::ItemKind::Static(..) => {}
+
             _ => return,
         };
 
-        self.check_missing_docs_attrs(cx, Some(it.hir_id), &it.attrs, it.span, desc);
+        let def_id = cx.tcx.hir().local_def_id(it.hir_id);
+        let (article, desc) = cx.tcx.article_and_description(def_id);
+
+        self.check_missing_docs_attrs(
+            cx,
+            Some(it.hir_id),
+            &it.attrs,
+            it.span,
+            &format!("{} {}", article, desc),
+        );
     }
 
     fn check_trait_item(&mut self, cx: &LateContext<'_, '_>, trait_item: &hir::TraitItem<'_>) {
         if self.private_traits.contains(&trait_item.hir_id) {
             return;
         }
 
-        let desc = match trait_item.kind {
-            hir::TraitItemKind::Const(..) => "an associated constant",
-            hir::TraitItemKind::Fn(..) => "a trait method",
-            hir::TraitItemKind::Type(..) => "an associated type",
-        };
+        let def_id = cx.tcx.hir().local_def_id(trait_item.hir_id);
+        let (article, desc) = cx.tcx.article_and_description(def_id);
 
         self.check_missing_docs_attrs(
             cx,
             Some(trait_item.hir_id),
             &trait_item.attrs,
             trait_item.span,
-            desc,
+            &format!("{} {}", article, desc),
         );
     }
 
@@ -483,18 +487,14 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MissingDoc {
             return;
         }
 
-        let desc = match impl_item.kind {
-            hir::ImplItemKind::Const(..) => "an associated constant",
-            hir::ImplItemKind::Fn(..) => "a method",
-            hir::ImplItemKind::TyAlias(_) => "an associated type",
-            hir::ImplItemKind::OpaqueTy(_) => "an associated `impl Trait` type",
-        };
+        let def_id = cx.tcx.hir().local_def_id(impl_item.hir_id);
+        let (article, desc) = cx.tcx.article_and_description(def_id);
         self.check_missing_docs_attrs(
             cx,
             Some(impl_item.hir_id),
             &impl_item.attrs,
             impl_item.span,
-            desc,
+            &format!("{} {}", article, desc),
         );
     }
 

src/test/ui/lint/lint-missing-doc.rs

@@ -50,8 +50,8 @@ trait B {
 }
 
 pub trait C { //~ ERROR: missing documentation for a trait
-    fn foo(&self); //~ ERROR: missing documentation for a trait method
-    fn foo_with_impl(&self) {} //~ ERROR: missing documentation for a trait method
+    fn foo(&self); //~ ERROR: missing documentation for an associated function
+    fn foo_with_impl(&self) {} //~ ERROR: missing documentation for an associated function
 }
 
 #[allow(missing_docs)]
@@ -78,7 +78,7 @@ impl Foo {
 }
 
 impl PubFoo {
-    pub fn foo() {} //~ ERROR: missing documentation for a method
+    pub fn foo() {} //~ ERROR: missing documentation for an associated function
     /// dox
     pub fn foo1() {}
     fn foo2() {}

src/test/ui/lint/lint-missing-doc.stderr

@@ -40,13 +40,13 @@ error: missing documentation for a trait
 LL | pub trait C {
    | ^^^^^^^^^^^
 
-error: missing documentation for a trait method
+error: missing documentation for an associated function
   --> $DIR/lint-missing-doc.rs:53:5
    |
 LL |     fn foo(&self);
    |     ^^^^^^^^^^^^^^
 
-error: missing documentation for a trait method
+error: missing documentation for an associated function
   --> $DIR/lint-missing-doc.rs:54:5
    |
 LL |     fn foo_with_impl(&self) {}
@@ -64,7 +64,7 @@ error: missing documentation for an associated type
 LL |     type AssociatedTypeDef = Self;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: missing documentation for a method
+error: missing documentation for an associated function
   --> $DIR/lint-missing-doc.rs:81:5
    |
 LL |     pub fn foo() {}

src/test/ui/privacy/private-in-public-non-principal.rs

@@ -10,7 +10,7 @@ pub fn leak_dyn_nonprincipal() -> Box<dyn PubPrincipal + PrivNonPrincipal> { loo
 #[deny(missing_docs)]
 fn container() {
     impl dyn PubPrincipal {
-        pub fn check_doc_lint() {} //~ ERROR missing documentation for a method
+        pub fn check_doc_lint() {} //~ ERROR missing documentation for an associated function
     }
     impl dyn PubPrincipal + PrivNonPrincipal {
         pub fn check_doc_lint() {} // OK, no missing doc lint

src/test/ui/privacy/private-in-public-non-principal.stderr

@@ -8,7 +8,7 @@ LL | pub fn leak_dyn_nonprincipal() -> Box<dyn PubPrincipal + PrivNonPrincipal>
    = 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 #34537 <https://github.com/rust-lang/rust/issues/34537>
 
-error: missing documentation for a method
+error: missing documentation for an associated function
   --> $DIR/private-in-public-non-principal.rs:13:9
    |
 LL |         pub fn check_doc_lint() {}