Remove unneeded SpanMapVisitor::visit_generics function

src/librustdoc/html/render/span_map.rs

@@ -5,7 +5,7 @@ use rustc_data_structures::fx::FxHashMap;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::DefId;
 use rustc_hir::intravisit::{self, Visitor};
-use rustc_hir::{ExprKind, Generics, HirId, Mod, Node, WherePredicate};
+use rustc_hir::{ExprKind, HirId, Mod, Node};
 use rustc_middle::hir::nested_filter;
 use rustc_middle::ty::TyCtxt;
 use rustc_span::Span;
@@ -100,18 +100,6 @@ impl<'tcx> Visitor<'tcx> for SpanMapVisitor<'tcx> {
         self.tcx.hir()
     }
 
-    fn visit_generics(&mut self, g: &'tcx Generics<'tcx>) {
-        for predicate in g.predicates {
-            if let WherePredicate::BoundPredicate(w) = predicate {
-                for bound in w.bounds {
-                    if let Some(trait_ref) = bound.trait_ref() {
-                        self.handle_path(trait_ref.path, None);
-                    }
-                }
-            }
-        }
-    }
-
     fn visit_path(&mut self, path: &'tcx rustc_hir::Path<'tcx>, _id: HirId) {
         self.handle_path(path, None);
         intravisit::walk_path(self, path);