diff --git a/util/must/must.go b/util/must/must.go
new file mode 100644
index 000000000..e195f017d
--- /dev/null
+++ b/util/must/must.go
@@ -0,0 +1,17 @@
+// Copyright (c) 2022 Tailscale Inc & 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 must assists in calling functions that must succeed.
+//
+// Example usage:
+//	var target = must.Do(url.Parse(...))
+package must
+
+// Do returns v as is. It panics if err is non-nil.
+func Do[T any](v T, err error) T {
+	if err != nil {
+		panic(err)
+	}
+	return v
+}