update:support overload anonymous reference

Author: luoliwoshang

gopls/internal/lsp/source/implementation_gox.go

@@ -430,6 +430,9 @@ func gopPathEnclosingObjNode(f *ast.File, pos token.Pos) []ast.Node {
 			if pos == n.Star {
 				pos = n.X.Pos()
 			}
+		case *ast.FuncLit:
+			//goxls:overload anonymous function
+			found = n.Type.Func <= pos && pos <= n.Type.Func+token.Pos(len("func"))
 		}
 
 		return !found

gopls/internal/lsp/source/references_gox.go

@@ -461,7 +461,11 @@ func gopOrdinaryReferences(ctx context.Context, snapshot Snapshot, uri span.URI,
 			// Report the locations of the declaration(s).
 			// TODO(adonovan): what about for corresponding methods? Add tests.
 			for _, node := range objects {
-				report(gopMustLocation(pgf, node), true)
+				if funcLit, ok := node.(*ast.FuncLit); ok {
+					report(gopMustLocation(pgf, funcLit.Type), true)
+				} else {
+					report(gopMustLocation(pgf, node), true)
+				}
 			}
 
 			// Convert targets map to set.
@@ -581,6 +585,9 @@ 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 {