libgo: update to Go1.18beta2

gotools/
	* Makefile.am (go_cmd_cgo_files): Add ast_go118.go
	(check-go-tool): Copy golang.org/x/tools directories.
	* Makefile.in: Regenerate.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/384695

1 files changed, 18 insertions, 0 deletions

diff --git a/libgo/go/testing/testing_windows.go b/libgo/go/testing/testing_windows.go
new file mode 100644
index 0000000..bc76cb8
--- /dev/null
+++ b/libgo/go/testing/testing_windows.go
@@ -0,0 +1,18 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build windows
+
+package testing
+
+import (
+	"errors"
+	"syscall"
+)
+
+// isWindowsAccessDenied reports whether err is ERROR_ACCESS_DENIED,
+// which is defined only on Windows.
+func isWindowsAccessDenied(err error) bool {
+	return errors.Is(err, syscall.ERROR_ACCESS_DENIED)
+}