Rustdoc-Json: Add test for extern_types

Author: aDotInTheVoid

src/test/rustdoc-json/type/extern.rs

@@ -0,0 +1,10 @@
+#![feature(extern_types)]
+
+extern {
+    /// No inner information
+    pub type Foo;
+}
+
+// @is "$.index[*][?(@.docs=='No inner information')].name" '"Foo"'
+// @is "$.index[*][?(@.docs=='No inner information')].kind" '"foreign_type"'
+// @!has "$.index[*][?(@.docs=='No inner information')].inner"

src/tools/jsondoclint/src/item_kind.rs

@@ -52,9 +52,9 @@ impl Kind {
             Macro => true,
             ProcMacro => true,
             Primitive => true,
+            ForeignType => true,
 
             // FIXME(adotinthevoid): I'm not sure if these are corrent
-            ForeignType => false,
             Keyword => false,
             OpaqueTy => false,
             ProcAttribute => false,

src/tools/jsondoclint/src/validator.rs

@@ -68,7 +68,7 @@ impl<'a> Validator<'a> {
                 ItemEnum::OpaqueTy(x) => self.check_opaque_ty(x),
                 ItemEnum::Constant(x) => self.check_constant(x),
                 ItemEnum::Static(x) => self.check_static(x),
-                ItemEnum::ForeignType => todo!(),
+                ItemEnum::ForeignType => {} // nop
                 ItemEnum::Macro(x) => self.check_macro(x),
                 ItemEnum::ProcMacro(x) => self.check_proc_macro(x),
                 ItemEnum::PrimitiveType(x) => self.check_primitive_type(x),
@@ -340,6 +340,13 @@ impl<'a> Validator<'a> {
         fp.generic_params.iter().for_each(|gpd| self.check_generic_param_def(gpd));
     }
 
+    // TODO: Remove
+    fn add_id(&mut self, id: &'a Id) {
+        if !self.seen_ids.contains(id) {
+            self.todo.insert(id);
+        }
+    }
+
     fn add_id_checked(&mut self, id: &'a Id, valid: fn(Kind) -> bool, expected: &str) {
         if let Some(kind) = self.kind_of(id) {
             if valid(kind) {