Remove Span from hir::TraitItemRef.

src/librustc_ast_lowering/item.rs

@@ -807,7 +807,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
         };
         let id = hir::TraitItemId { hir_id: self.lower_node_id(i.id, i.span) };
         let defaultness = hir::Defaultness::Default { has_value: has_default };
-        hir::TraitItemRef { id, ident: i.ident, span: i.span, defaultness, kind }
+        hir::TraitItemRef { id, ident: i.ident, defaultness, kind }
     }
 
     /// Construct `ExprKind::Err` for the given `span`.

src/librustc_hir/hir.rs

@@ -2564,7 +2564,6 @@ pub struct TraitItemRef {
     #[stable_hasher(project(name))]
     pub ident: Ident,
     pub kind: AssocItemKind,
-    pub span: Span,
     pub defaultness: Defaultness,
 }
 

src/librustc_hir/intravisit.rs

@@ -932,7 +932,7 @@ pub fn walk_trait_item<'v, V: Visitor<'v>>(visitor: &mut V, trait_item: &'v Trai
 
 pub fn walk_trait_item_ref<'v, V: Visitor<'v>>(visitor: &mut V, trait_item_ref: &'v TraitItemRef) {
     // N.B., deliberately force a compilation error if/when new fields are added.
-    let TraitItemRef { id, ident, ref kind, span: _, ref defaultness } = *trait_item_ref;
+    let TraitItemRef { id, ident, ref kind, ref defaultness } = *trait_item_ref;
     visitor.visit_nested_trait_item(id);
     visitor.visit_ident(ident);
     visitor.visit_associated_item_kind(kind);

src/librustc_middle/hir/map/collector.rs

@@ -540,7 +540,7 @@ impl<'a, 'hir> Visitor<'hir> for NodeCollector<'a, 'hir> {
     fn visit_trait_item_ref(&mut self, ii: &'hir TraitItemRef) {
         // Do not visit the duplicate information in TraitItemRef. We want to
         // map the actual nodes, not the duplicate ones in the *Ref.
-        let TraitItemRef { id, ident: _, kind: _, span: _, defaultness: _ } = *ii;
+        let TraitItemRef { id, ident: _, kind: _, defaultness: _ } = *ii;
 
         self.visit_nested_trait_item(id);
     }

src/librustc_middle/ty/error.rs

@@ -821,7 +821,7 @@ fn foo(&self) -> Self::T { String::new() }
                             {
                                 if self.type_of(self.hir().local_def_id(item.id.hir_id)) == found {
                                     db.span_label(
-                                        item.span,
+                                        self.hir().span(item.id.hir_id),
                                         "associated type defaults can't be assumed inside the \
                                             trait defining them",
                                     );