3 files changed, 19 insertions, 10 deletions
diff --git a/src/rustdoc-json-types/Cargo.toml b/src/rustdoc-json-types/Cargo.toml
index d63caa7ad..d3548036d 100644
--- a/src/rustdoc-json-types/Cargo.toml
+++ b/src/rustdoc-json-types/Cargo.toml
@@ -12,3 +12,4 @@ rustc-hash = "1.1.0"
 
 [dev-dependencies]
 serde_json = "1.0"
+bincode = "1"
diff --git a/src/rustdoc-json-types/lib.rs b/src/rustdoc-json-types/lib.rs
index 3cf8ceed6..ba8eeaa66 100644
--- a/src/rustdoc-json-types/lib.rs
+++ b/src/rustdoc-json-types/lib.rs
@@ -8,7 +8,7 @@ use serde::{Deserialize, Serialize};
 use std::path::PathBuf;
 
 /// rustdoc format-version.
-pub const FORMAT_VERSION: u32 = 24;
+pub const FORMAT_VERSION: u32 = 26;
 
 /// A `Crate` is the root of the emitted JSON blob. It contains all type/documentation information
 /// about the language items in the local crate, as well as info about external items to allow
@@ -83,7 +83,6 @@ pub struct Item {
     /// Stringified versions of the attributes on this item (e.g. `"#[inline]"`)
     pub attrs: Vec<String>,
     pub deprecation: Option<Deprecation>,
-    #[serde(flatten)]
     pub inner: ItemEnum,
 }
 
@@ -222,7 +221,7 @@ pub enum ItemKind {
 }
 
 #[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
-#[serde(tag = "kind", content = "inner", rename_all = "snake_case")]
+#[serde(rename_all = "snake_case")]
 pub enum ItemEnum {
     Module(Module),
     ExternCrate {
@@ -543,7 +542,6 @@ pub enum Term {
 
 #[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
 #[serde(rename_all = "snake_case")]
-#[serde(tag = "kind", content = "inner")]
 pub enum Type {
     /// Structs, enums, and unions
     ResolvedPath(Path),
@@ -581,13 +579,15 @@ pub enum Type {
         #[serde(rename = "type")]
         type_: Box<Type>,
     },
-    /// `<Type as Trait>::Name` or associated types like `T::Item` where `T: Iterator`
+    /// Associated types like `<Type as Trait>::Name` and `T::Item` where
+    /// `T: Iterator` or inherent associated types like `Struct::Name`.
     QualifiedPath {
         name: String,
         args: Box<GenericArgs>,
         self_type: Box<Type>,
+        /// `None` iff this is an *inherent* associated type.
         #[serde(rename = "trait")]
-        trait_: Path,
+        trait_: Option<Path>,
     },
 }
 
diff --git a/src/rustdoc-json-types/tests.rs b/src/rustdoc-json-types/tests.rs
index 399ff54b2..1126d5f78 100644
--- a/src/rustdoc-json-types/tests.rs
+++ b/src/rustdoc-json-types/tests.rs
@@ -8,11 +8,15 @@ fn test_struct_info_roundtrip() {
         impls: vec![],
     });
 
+    // JSON
     let struct_json = serde_json::to_string(&s).unwrap();
-
     let de_s = serde_json::from_str(&struct_json).unwrap();
-
     assert_eq!(s, de_s);
+
+    // Bincode
+    let encoded: Vec<u8> = bincode::serialize(&s).unwrap();
+    let decoded: ItemEnum = bincode::deserialize(&encoded).unwrap();
+    assert_eq!(s, decoded);
 }
 
 #[test]
@@ -24,9 +28,13 @@ fn test_union_info_roundtrip() {
         impls: vec![],
     });
 
+    // JSON
     let union_json = serde_json::to_string(&u).unwrap();
-
     let de_u = serde_json::from_str(&union_json).unwrap();
-
     assert_eq!(u, de_u);
+
+    // Bincode
+    let encoded: Vec<u8> = bincode::serialize(&u).unwrap();
+    let decoded: ItemEnum = bincode::deserialize(&encoded).unwrap();
+    assert_eq!(u, decoded);
 }