patch: errors (todo)

internal/build/build.go

@@ -706,7 +706,7 @@ func decodeFile(outFile string, zipf *zip.File) (err error) {
 
 func canSkipToBuild(pkgPath string) bool {
 	switch pkgPath {
-	case "unsafe", "errors": // TODO(xsw): remove it
+	case "unsafe":
 		return true
 	default:
 		return strings.HasPrefix(pkgPath, "internal/") ||
@@ -717,6 +717,7 @@ func canSkipToBuild(pkgPath string) bool {
 type none struct{}
 
 var hasAltPkg = map[string]none{
+	"errors":      {},
 	"math":        {},
 	"sync":        {},
 	"sync/atomic": {},

internal/lib/errors/errors.go

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package errors