}
	}
	{
		var flagSet flag.FlagSet
		err := do(&b, &flagSet, []string{"nosuchpackage", "Foo"})
		if err == nil {
			// actually present in the user's filesystem
		} else if !strings.Contains(err.Error(), "no such package") {
			t.Errorf("unexpected error %q from nosuchpackage Foo", err)
		}
	}
}

// Test the code to look up packages when the first argument starts with "./".