update:support overload anonymous reference

Author: luoliwoshang

Diff for: gopls/internal/lsp/source/implementation_gox.go

@@ -430,6 +430,8 @@ func gopPathEnclosingObjNode(f *ast.File, pos token.Pos) []ast.Node {
 			if pos == n.Star {
 				pos = n.X.Pos()
 			}
+		case *ast.FuncLit:
+			found = n.Type.Func == pos
 		}
 
 		return !found

Diff for: gopls/internal/lsp/source/references_gox.go

@@ -581,6 +581,9 @@ func gopObjectsAt(info *typesutil.Info, file *ast.File, pos token.Pos) (map[type
 			return nil, nil, fmt.Errorf("%w for import %s", errNoObjectFound, GopUnquoteImportPath(leaf))
 		}
 		targets[obj] = leaf
+	case *ast.FuncLit:
+		obj := info.Implicits[leaf]
+		targets[obj] = leaf
 	}
 
 	if len(targets) == 0 {