--- /dev/null
+// Copyright 2020 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.
+
+package main
+
+import (
+ "testing"
+
+ "golang.org/x/tools/internal/testenv"
+)
+
+func TestGenerated(t *testing.T) {
+ testenv.NeedsGoBuild(t) // This is a lie. We actually need the source code.
+
+ ok, err := doMain("../..", false)
+ if err != nil {
+ t.Fatal(err)
+ }
+ if !ok {
+ t.Error("documentation needs updating. run: `go run gopls/doc/generate.go` from the root of tools.")
+ }
+}