rustdoc: Remove Derived Implementations title

src/librustdoc/clean/inline.rs

@@ -425,7 +425,6 @@ pub fn build_impl<'a, 'tcx>(cx: &DocContext,
     ret.push(clean::Item {
         inner: clean::ImplItem(clean::Impl {
             unsafety: hir::Unsafety::Normal, // FIXME: this should be decoded
-            derived: clean::detect_derived(&attrs),
             provided_trait_methods: provided,
             trait_: trait_,
             for_: for_,

src/librustdoc/clean/mod.rs

@@ -2239,14 +2239,9 @@ pub struct Impl {
     pub trait_: Option<Type>,
     pub for_: Type,
     pub items: Vec<Item>,
-    pub derived: bool,
     pub polarity: Option<ImplPolarity>,
 }
 
-fn detect_derived<M: AttrMetaMethods>(attrs: &[M]) -> bool {
-    attr::contains_name(attrs, "automatically_derived")
-}
-
 impl Clean<Vec<Item>> for doctree::Impl {
     fn clean(&self, cx: &DocContext) -> Vec<Item> {
         let mut ret = Vec::new();
@@ -2283,7 +2278,6 @@ impl Clean<Vec<Item>> for doctree::Impl {
                 trait_: trait_,
                 for_: self.for_.clean(cx),
                 items: items,
-                derived: detect_derived(&self.attrs),
                 polarity: Some(self.polarity.clean(cx)),
             }),
         });

src/librustdoc/html/render.rs

@@ -399,7 +399,6 @@ fn init_ids() -> HashMap<String, usize> {
      "methods",
      "deref-methods",
      "implementations",
-     "derived_implementations"
      ].into_iter().map(|id| (String::from(*id), 1)).collect()
 }
 
@@ -2501,25 +2500,11 @@ fn render_assoc_items(w: &mut fmt::Formatter,
         }
         write!(w, "<h2 id='implementations'>Trait \
                    Implementations</h2>")?;
-        let (derived, manual): (Vec<_>, Vec<&Impl>) = traits.iter().partition(|i| {
-            i.inner_impl().derived
-        });
-        for i in &manual {
+        for i in &traits {
             let did = i.trait_did().unwrap();
             let assoc_link = AssocItemLink::GotoSource(did, &i.inner_impl().provided_trait_methods);
             render_impl(w, cx, i, assoc_link, true, containing_item.stable_since())?;
         }
-        if !derived.is_empty() {
-            write!(w, "<h3 id='derived_implementations'>\
-                           Derived Implementations \
-                       </h3>")?;
-            for i in &derived {
-                let did = i.trait_did().unwrap();
-                let assoc_link = AssocItemLink::GotoSource(did,
-                                                           &i.inner_impl().provided_trait_methods);
-                render_impl(w, cx, i, assoc_link, true, containing_item.stable_since())?;
-            }
-        }
     }
     Ok(())
 }