Rollup merge of #96636 - GuillaumeGomez:fix-jump-to-def-regression, r=notriddle

Fix jump to def regression

https://github.com/rust-lang/rust/pull/93803 introduced a regression in the "jump to def" feature. This fixes it.

Nice side-effect: it adds a new regression test. :)

I also used this opportunity to add documentation about this unstable feature in the rustdoc book.

cc ``@cjgillot``
r? ``@notriddle``

1 files changed, 1 insertions, 3 deletions

diff --git a/src/librustdoc/html/render/span_map.rs b/src/librustdoc/html/render/span_map.rs
index b5502309560..1ae888d059d 100644
--- a/src/librustdoc/html/render/span_map.rs
+++ b/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, GenericParam, HirId, Mod, Node};
+use rustc_hir::{ExprKind, HirId, Mod, Node};
 use rustc_middle::hir::nested_filter;
 use rustc_middle::ty::TyCtxt;
 use rustc_span::Span;
@@ -100,8 +100,6 @@ impl<'tcx> Visitor<'tcx> for SpanMapVisitor<'tcx> {
         self.tcx.hir()
     }
 
-    fn visit_generic_param(&mut self, _: &'tcx GenericParam<'tcx>) {}
-
     fn visit_path(&mut self, path: &'tcx rustc_hir::Path<'tcx>, _id: HirId) {
         self.handle_path(path, None);
         intravisit::walk_path(self, path);