scala> case class `X"`(var xxx: Any)
defined class X$u0022

scala> val m = Map(("": Any) -> `X"`("\""), ('s: Any) -> `X"`("\""))
m: scala.collection.immutable.Map[Any,X"] = Map("" -> X"("), 's -> X"("))

scala> m("")
res0: X" = X"(")

scala> m("").xxx
res1: Any = "

scala> m("").xxx = 0
m("").xxx: Any = 0

scala> m("").xxx = "\""
m("").xxx: Any = "

scala> m('s).xxx = 's
m(scala.Symbol("s")).xxx: Any = 's

scala> val `"` = 0
": Int = 0

scala> :quit