hir: remove trait_auto_impl

Author: ljedrz

src/librustc/hir/lowering.rs

@@ -90,7 +90,6 @@ pub struct LoweringContext<'a> {
     exported_macros: Vec<hir::MacroDef>,
 
     trait_impls: BTreeMap<DefId, Vec<hir::HirId>>,
-    trait_auto_impl: BTreeMap<DefId, NodeId>,
 
     modules: BTreeMap<NodeId, hir::ModuleItems>,
 
@@ -233,7 +232,6 @@ pub fn lower_crate(
         impl_items: BTreeMap::new(),
         bodies: BTreeMap::new(),
         trait_impls: BTreeMap::new(),
-        trait_auto_impl: BTreeMap::new(),
         modules: BTreeMap::new(),
         exported_macros: Vec::new(),
         catch_scopes: Vec::new(),
@@ -514,7 +512,6 @@ impl<'a> LoweringContext<'a> {
             bodies: self.bodies,
             body_ids,
             trait_impls: self.trait_impls,
-            trait_auto_impl: self.trait_auto_impl,
             modules: self.modules,
         }
     }

src/librustc/hir/map/collector.rs

@@ -121,7 +121,6 @@ impl<'a, 'hir> NodeCollector<'a, 'hir> {
                 impl_items: _,
                 bodies: _,
                 trait_impls: _,
-                trait_auto_impl: _,
                 body_ids: _,
                 modules: _,
             } = *krate;

src/librustc/hir/map/mod.rs

@@ -563,18 +563,6 @@ impl<'hir> Map<'hir> {
         self.forest.krate.trait_impls.get(&trait_did).map_or(&[], |xs| &xs[..])
     }
 
-    pub fn trait_auto_impl(&self, trait_did: DefId) -> Option<NodeId> {
-        self.dep_graph.read(DepNode::new_no_params(DepKind::AllLocalTraitImpls));
-
-        // N.B., intentionally bypass `self.forest.krate()` so that we
-        // do not trigger a read of the whole krate here
-        self.forest.krate.trait_auto_impl.get(&trait_did).cloned()
-    }
-
-    pub fn trait_is_auto(&self, trait_did: DefId) -> bool {
-        self.trait_auto_impl(trait_did).is_some()
-    }
-
     /// Gets the attributes on the crate. This is preferable to
     /// invoking `krate.attrs` because it registers a tighter
     /// dep-graph access.

src/librustc/hir/mod.rs

@@ -724,7 +724,6 @@ pub struct Crate {
     pub impl_items: BTreeMap<ImplItemId, ImplItem>,
     pub bodies: BTreeMap<BodyId, Body>,
     pub trait_impls: BTreeMap<DefId, Vec<HirId>>,
-    pub trait_auto_impl: BTreeMap<DefId, NodeId>,
 
     /// A list of the body ids written out in the order in which they
     /// appear in the crate. If you're going to process all the bodies