rice doesn't find cmds where a const is used

repro.go

package main

import (
	"fmt"

	"github.com/GeertJohan/go.rice"
)

const weirdTmp = "/tmp/weird"

func main() {
	dot := rice.MustFindBox(".")
	fmt.Println("dot:", dot)

	constDir := rice.MustFindBox(weirdTmp)
	fmt.Println("constDir:", constDir)
}