jsondoclint: Recognise Typedef as valid kind for Type::ResolvedPath

Closes #104851

src/test/rustdoc-json/fns/return_type_alias.rs

@@ -0,0 +1,10 @@
+// Regression test for <https://github.com/rust-lang/rust/issues/104851>
+
+/// @set foo = "$.index[*][?(@.name=='Foo')].id"
+pub type Foo = i32;
+
+// @is "$.index[*][?(@.name=='demo')].inner.decl.output.kind" '"resolved_path"'
+// @is "$.index[*][?(@.name=='demo')].inner.decl.output.inner.id" $foo
+pub fn demo() -> Foo {
+    42
+}

src/tools/jsondoclint/src/item_kind.rs

@@ -114,8 +114,8 @@ pub fn is_variant(self) -> bool {
     pub fn is_trait(self) -> bool {
         matches!(self, Kind::Trait)
     }
-    pub fn is_struct_enum_union(self) -> bool {
-        matches!(self, Kind::Struct | Kind::Enum | Kind::Union)
+    pub fn is_type(self) -> bool {
+        matches!(self, Kind::Struct | Kind::Enum | Kind::Union | Kind::Typedef)
     }
 
     pub fn from_item(i: &Item) -> Self {

src/tools/jsondoclint/src/validator.rs

@@ -32,7 +32,10 @@ pub struct Validator<'a> {
 
 enum PathKind {
     Trait,
-    StructEnumUnion,
+    /// Structs, Enums, Unions and Typedefs.
+    ///
+    /// This doesn't include trait's because traits are not types.
+    Type,
 }
 
 impl<'a> Validator<'a> {
@@ -224,7 +227,7 @@ fn check_generics(&mut self, x: &'a Generics) {
 
     fn check_type(&mut self, x: &'a Type) {
         match x {
-            Type::ResolvedPath(path) => self.check_path(path, PathKind::StructEnumUnion),
+            Type::ResolvedPath(path) => self.check_path(path, PathKind::Type),
             Type::DynTrait(dyn_trait) => self.check_dyn_trait(dyn_trait),
             Type::Generic(_) => {}
             Type::Primitive(_) => {}
@@ -264,7 +267,7 @@ fn check_generic_bound(&mut self, x: &'a GenericBound) {
     fn check_path(&mut self, x: &'a Path, kind: PathKind) {
         match kind {
             PathKind::Trait => self.add_trait_id(&x.id),
-            PathKind::StructEnumUnion => self.add_struct_enum_union_id(&x.id),
+            PathKind::Type => self.add_type_id(&x.id),
         }
         if let Some(args) = &x.args {
             self.check_generic_args(&**args);
@@ -392,8 +395,8 @@ fn add_trait_id(&mut self, id: &'a Id) {
         self.add_id_checked(id, Kind::is_trait, "Trait");
     }
 
-    fn add_struct_enum_union_id(&mut self, id: &'a Id) {
-        self.add_id_checked(id, Kind::is_struct_enum_union, "Struct or Enum or Union");
+    fn add_type_id(&mut self, id: &'a Id) {
+        self.add_id_checked(id, Kind::is_type, "Type (Struct, Enum, Union or Typedef)");
     }
 
     /// Add an Id that appeared in a trait