Move ItemEnum → Generics logic into method on ItemEnum.

src/librustdoc/clean/mod.rs

@@ -380,6 +380,23 @@ pub enum ItemEnum {
     StrippedItem(Box<ItemEnum>),
 }
 
+impl ItemEnum {
+    pub fn generics(&self) -> Option<&Generics> {
+        Some(match *self {
+            ItemEnum::StructItem(ref s) => &s.generics,
+            ItemEnum::EnumItem(ref e) => &e.generics,
+            ItemEnum::FunctionItem(ref f) => &f.generics,
+            ItemEnum::TypedefItem(ref t, _) => &t.generics,
+            ItemEnum::TraitItem(ref t) => &t.generics,
+            ItemEnum::ImplItem(ref i) => &i.generics,
+            ItemEnum::TyMethodItem(ref i) => &i.generics,
+            ItemEnum::MethodItem(ref i) => &i.generics,
+            ItemEnum::ForeignFunctionItem(ref f) => &f.generics,
+            _ => return None,
+        })
+    }
+}
+
 #[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct Module {
     pub items: Vec<Item>,

src/librustdoc/html/render.rs

@@ -997,17 +997,8 @@ impl DocFolder for Cache {
 
         // Register any generics to their corresponding string. This is used
         // when pretty-printing types
-        match item.inner {
+        if let Some(generics) = item.inner.generics() {
-            clean::StructItem(ref s)          => self.generics(&s.generics),
+            self.generics(generics);
-            clean::EnumItem(ref e)            => self.generics(&e.generics),
-            clean::FunctionItem(ref f)        => self.generics(&f.generics),
-            clean::TypedefItem(ref t, _)      => self.generics(&t.generics),
-            clean::TraitItem(ref t)           => self.generics(&t.generics),
-            clean::ImplItem(ref i)            => self.generics(&i.generics),
-            clean::TyMethodItem(ref i)        => self.generics(&i.generics),
-            clean::MethodItem(ref i)          => self.generics(&i.generics),
-            clean::ForeignFunctionItem(ref f) => self.generics(&f.generics),
-            _ => {}
         }
 
         if !self.seen_mod {