REPL needs a compilation wrapper

[som-snytt]

You'd like to say, $intp.setCompilationWrapper("reflect.runtime.universe.reify").

A :show or :print command to turn that on and off would work. :show off.

REPL needs a compilation wrapper to complement the execution wrapper, which wraps the wrong text. After writing a macro that forwards to reify, I realized it was capturing the wrong thing:

scala> $intp.setExecutionWrapper("q.r")

scala> 42
Expr[String]({
  $read.$iw;
  "res2: Int = ".$plus(ScalaRunTime.replStringOf($read.res2, 1000))
})