Sorry about the formatting glitches, trying again:
val m = Map(1->"a",2->"b",3->"c")
val field = m(1).getClass.getDeclaredField("value")
field.setAccessible(true)
val mods = field.getClass.getDeclaredField("modifiers")
mods.setAccessible(true)
mods.setInt(field, field.getModifiers & ~java.lang.reflect.Modifier.FINAL)
field.set(m(1), field.get(m(2)))
println(m)
// => Map(1 -> b, 2 -> b, 3 -> c)
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