Explicitly match all DefKind item in conversion to TypeKind

src/librustdoc/clean/types.rs

@@ -1304,6 +1304,49 @@ crate enum TypeKind {
     Primitive,
 }
 
+impl<'a> From<&'a hir::def::DefKind> for TypeKind {
+    fn from(other: &hir::def::DefKind) -> Self {
+        Self::from(*other)
+    }
+}
+
+impl From<hir::def::DefKind> for TypeKind {
+    fn from(other: hir::def::DefKind) -> Self {
+        match other {
+            hir::def::DefKind::Enum => Self::Enum,
+            hir::def::DefKind::Fn => Self::Function,
+            hir::def::DefKind::Mod => Self::Module,
+            hir::def::DefKind::Const => Self::Const,
+            hir::def::DefKind::Static => Self::Static,
+            hir::def::DefKind::Struct => Self::Struct,
+            hir::def::DefKind::Union => Self::Union,
+            hir::def::DefKind::Trait => Self::Trait,
+            hir::def::DefKind::TyAlias => Self::Typedef,
+            hir::def::DefKind::ForeignTy => Self::Foreign,
+            hir::def::DefKind::TraitAlias => Self::TraitAlias,
+            hir::def::DefKind::Macro(_) => Self::Macro,
+            hir::def::DefKind::Variant
+            | hir::def::DefKind::AssocTy
+            | hir::def::DefKind::TyParam
+            | hir::def::DefKind::ConstParam
+            | hir::def::DefKind::Ctor(..)
+            | hir::def::DefKind::AssocFn
+            | hir::def::DefKind::AssocConst
+            | hir::def::DefKind::ExternCrate
+            | hir::def::DefKind::Use
+            | hir::def::DefKind::ForeignMod
+            | hir::def::DefKind::AnonConst
+            | hir::def::DefKind::OpaqueTy
+            | hir::def::DefKind::Field
+            | hir::def::DefKind::LifetimeParam
+            | hir::def::DefKind::GlobalAsm
+            | hir::def::DefKind::Impl
+            | hir::def::DefKind::Closure
+            | hir::def::DefKind::Generator => Self::Foreign,
+        }
+    }
+}
+
 crate trait GetDefId {
     /// Use this method to get the [`DefId`] of a [`clean`] AST node.
     /// This will return [`None`] when called on a primitive [`clean::Type`].